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(3/4)*x-((8/9)*y) = -5 // + 5
(3/4)*x-((8/9)*y)+5 = 0
(3/4)*x+(-8/9)*y+5 = 0
3/4*x-8/9*y+5 = 0 // - 5-8/9*y
3/4*x = -(5-8/9*y) // : 3/4
x = (-(5-8/9*y))/3/4
x = -4/3*(5-8/9*y)
x = -4/3*(5-8/9*y)
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