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(20-x)/4 = 3*y // - 3*y
(20-x)/4-(3*y) = 0
(20-x)/4-3*y = 0
(20-x)/4+(-3*4*y)/4 = 0
20-x-3*4*y = 0
20-x-12*y = 0
(20-x-12*y)/4 = 0
(20-x-12*y)/4 = 0 // * 4
20-x-12*y = 0
20-x-12*y = 0 // - 20-12*y
-x = -(20-12*y) // * -1
x = 20-12*y
x = 20-12*y
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