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x in (-oo:+oo)
(2/3)*x+(3/4)*x = 0.34 // - 0.34
(2/3)*x+(3/4)*x-0.34 = 0
17/12*x-0.34 = 0 // + 0.34
17/12*x = 0.34 // : 17/12
x = 0.34/17/12
x = 0.24
x = 0.24
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