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(40/2)*x+(40/4)*y = 12 // - 12
(40/2)*x+(40/4)*y-12 = 0
20*x+10*y-12 = 0 // - 10*y-12
20*x = -(10*y-12) // : 20
x = (-(10*y-12))/20
x = (12-(10*y))/20
x = (12-(10*y))/20
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