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(4/5)*x+2 = (3/4)*x+17/10 // - (3/4)*x+17/10
(4/5)*x-((3/4)*x)-(17/10)+2 = 0
(4/5)*x+(-3/4)*x-17/10+2 = 0
1/20*x+3/10 = 0 // - 3/10
1/20*x = -3/10 // : 1/20
x = -3/10/1/20
x = -6
x = -6
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