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(1/2)*(x-(3*y)) = 4 // - 4
(1/2)*(x-(3*y))-4 = 0
(1/2)*(x-3*y)-4 = 0
1/2*(x-3*y)-4 = 0
1/2*(x-3*y)-4 = 0
1/2*x-3/2*y-4 = 0
1/2*x-3/2*y-4 = 0
1/2*x-3/2*y-4 = 0 // + -3/2*y-4
1/2*x = -(-3/2*y-4) // : 1/2
x = (-(-3/2*y-4))/1/2
x = 2*(4-(-3/2*y))
x = 2*(4-(-3/2*y))
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