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(1/2)*x-4 = 3*x-49 // - 3*x-49
(1/2)*x-(3*x)-4+49 = 0
(1/2)*x-3*x-4+49 = 0
45-5/2*x = 0 // - 45
-5/2*x = -45 // : -5/2
x = -45/(-5/2)
x = 18
x = 18
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