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