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(1/2)*x-10 = 4*x+70 // - 4*x+70
(1/2)*x-(4*x)-70-10 = 0
(1/2)*x-4*x-70-10 = 0
-7/2*x-80 = 0 // + 80
-7/2*x = 80 // : -7/2
x = 80/(-7/2)
x = -160/7
x = -160/7
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