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x in (-oo:+oo)
3*x = -7/4 // + -7/4
3*x-(-7/4) = 0
3*x+7/4 = 0
3*x+7/4 = 0 // - 7/4
3*x = -7/4 // : 3
x = -7/4/3
x = -7/12
x = -7/12
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