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x in (-oo:+oo)
1*x-((1/7)*x) = 18 // - 18
1*x-((1/7)*x)-18 = 0
x+(-1/7)*x-18 = 0
6/7*x-18 = 0 // + 18
6/7*x = 18 // : 6/7
x = 18/6/7
x = 21
x = 21
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