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(1/2)*x+1/4 = -3 // + 3
(1/2)*x+1/4+3 = 0
1/2*x+13/4 = 0 // - 13/4
1/2*x = -13/4 // : 1/2
x = -13/4/1/2
x = -13/2
x = -13/2
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