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