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3*x-((1/4)*y) = 8 // - 8
3*x-((1/4)*y)-8 = 0
3*x+(-1/4)*y-8 = 0
3*x-1/4*y-8 = 0 // + -1/4*y-8
3*x = -(-1/4*y-8) // : 3
x = (-(-1/4*y-8))/3
x = (8-(-1/4*y))/3
x = (8-(-1/4*y))/3
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