Solve the equations by doing addition. Let h below represent the heart
h + @ + # + x = 36
2x + 2h= 40
3h + x= 36
3h + #= 37
Solving the above gives you h = 8 and x = 12 and # = 13 and @ = 5.
So the missing line is 2h + x + @ = 33.
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