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(1/2)*x+1/2 = (-1/2)*x+7/10 // - (-1/2)*x+7/10
(1/2)*x-((-1/2)*x)+1/2-(7/10) = 0
(1/2)*x+(1/2)*x+1/2-7/10 = 0
x-1/5 = 0 // + 1/5
x = 1/5
x = 1/5
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