Please help me make a redox reaction

[Zalerant]

Hello.
I would be grateful if you could help me formulate such a redox reaction:
Ca+K₂Cr₂O₇+H₂SO₄-->Cr₂(SO₄)₃+....+..... 📖
They say that you need to use the electronic balance method, but I don't understand how to do it. Help me make up a reaction, please

[ChenBeier]

Bad example
Cr₂O₇ 2- => Cr 3+ Redoxpair
Cr₂O₇ 2- + 14 H+ => 2 Cr 3+ + 7 H₂O Remove oxygen by water

Cr₂O₇ 2- + 14 H+ + 6 e- => 2 Cr 3+ + 7 H₂O Balance Charge

Ca => Ca 2+ Redoxpair
Ca=> Ca 2+ + 2e- Balance Charge
3 Ca => 3 Ca 2+ + 6 e-Balance electrons

Cr₂O₇ 2- + 14 H+ + 3 Ca => 2Cr 3+ + 3 Ca 2+ 7 H₂O Addition of both equation
K₂Cr₂O₇ +7 H₂SO₄ + 3 Ca => Cr₂(SO₄)₃ + 3 CaSO₄ + K₂SO₄ + 7 H₂O Add spectator ions
Finished

[StevenAppell]

THANKS

[sofiacals]

Bad example
Cr₂O₇ 2- => Cr 3+ Redoxpair
Cr₂O₇ 2- + 14 H+ => 2 Cr 3+ + 7 H₂O Remove oxygen by water

Cr₂O₇ 2- + 14 H+ + 6 e- => 2 Cr 3+ + 7 H₂O Balance Charge

Ca => Ca 2+ Redoxpair
Ca=> Ca 2+ + 2e- Balance Charge
3 Ca => 3 Ca 2+ + 6 e-Balance electrons

Cr₂O₇ 2- + 14 H+ + 3 Ca => 2Cr 3+ + 3 Ca 2+ 7 H₂O Addition of both equation
K₂Cr₂O₇ +7 H₂SO₄ + 3 Ca => Cr₂(SO₄)₃ + 3 CaSO₄ + K₂SO₄ + 7 H₂O Add spectator ions
Finished

A perfect answer.
Thanks