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(1.5*x)/8 = x-4.2 // - x-4.2
(1.5*x)/8-x+4.2 = 0
4.2-0.8125*x = 0 // - 4.2
-0.8125*x = -4.2 // : -0.8125
x = -4.2/(-0.8125)
x = 5.16923077
x = 5.16923077
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