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(1/4)*x+1/2 = -3 // + 3
(1/4)*x+1/2+3 = 0
1/4*x+7/2 = 0 // - 7/2
1/4*x = -7/2 // : 1/4
x = -7/2/1/4
x = -14
x = -14
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