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x in (-oo:+oo)
x/2 = -7/4 // + -7/4
x/2-(-7/4) = 0
x/2+7/4 = 0
1/2*x+7/4 = 0 // - 7/4
1/2*x = -7/4 // : 1/2
x = -7/4/1/2
x = -7/2
x = -7/2
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