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(1/5)*(3*x-85) = 4*x // - 4*x
(1/5)*(3*x-85)-(4*x) = 0
(1/5)*(3*x-85)-4*x = 0
1/5*(3*x-85)-4*x = 0
1/5*(3*x-85)-4*x = 0
-17/5*x-17 = 0
-17/5*x-17 = 0
-17/5*x-17 = 0 // + 17
-17/5*x = 17 // : -17/5
x = 17/(-17/5)
x = -5
x = -5
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