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(7*x)/8-3 = (9*x)/12-5 // - (9*x)/12-5
(7*x)/8-((9*x)/12)-3+5 = 0
(7*x)/8+(-3/4)*x-3+5 = 0
1/8*x+2 = 0 // - 2
1/8*x = -2 // : 1/8
x = -2/1/8
x = -16
x = -16
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