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x in (-oo:+oo)
(2/3)*x+(3/4)*x = -34 // + 34
(2/3)*x+(3/4)*x+34 = 0
17/12*x+34 = 0 // - 34
17/12*x = -34 // : 17/12
x = -34/17/12
x = -24
x = -24
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