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x in (-oo:+oo)
(1/3)*x+1/2 = -3 // + 3
(1/3)*x+1/2+3 = 0
1/3*x+7/2 = 0 // - 7/2
1/3*x = -7/2 // : 1/3
x = -7/2/1/3
x = -21/2
x = -21/2
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