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x in (-oo:+oo)
x/4+(3*x)/2 = 7 // - 7
x/4+(3*x)/2-7 = 0
7/4*x-7 = 0 // + 7
7/4*x = 7 // : 7/4
x = 7/7/4
x = 4
x = 4
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