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