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x in (-oo:+oo)
x/2+7 = (2*x)/3 // - (2*x)/3
x/2-((2*x)/3)+7 = 0
x/2+(-2/3)*x+7 = 0
7-1/6*x = 0 // - 7
-1/6*x = -7 // : -1/6
x = -7/(-1/6)
x = 42
x = 42
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