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(3/4)*(5*x-y) = 10 // - 10
(3/4)*(5*x-y)-10 = 0
3/4*(5*x-y)-10 = 0
3/4*(5*x-y)-10 = 0
15/4*x-3/4*y-10 = 0
15/4*x-3/4*y-10 = 0
15/4*x-3/4*y-10 = 0 // + -3/4*y-10
15/4*x = -(-3/4*y-10) // : 15/4
x = (-(-3/4*y-10))/15/4
x = 4/15*(10-(-3/4*y))
x = 4/15*(10-(-3/4*y))
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