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(1/2)*x+3/8 = -2*x // + -2*x
(1/2)*x-(-2*x)+3/8 = 0
(1/2)*x+2*x+3/8 = 0
5/2*x+3/8 = 0 // - 3/8
5/2*x = -3/8 // : 5/2
x = -3/8/5/2
x = -3/20
x = -3/20
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