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(3/4)*x-((3/5)*y) = 12 // - 12
(3/4)*x-((3/5)*y)-12 = 0
(3/4)*x+(-3/5)*y-12 = 0
3/4*x-3/5*y-12 = 0 // + -3/5*y-12
3/4*x = -(-3/5*y-12) // : 3/4
x = (-(-3/5*y-12))/3/4
x = 4/3*(12-(-3/5*y))
x = 4/3*(12-(-3/5*y))
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