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(3*x)/4+x = 3*x+20 // - 3*x+20
(3*x)/4+x-(3*x)-20 = 0
(3*x)/4+x-3*x-20 = 0
-5/4*x-20 = 0 // + 20
-5/4*x = 20 // : -5/4
x = 20/(-5/4)
x = -16
x = -16
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