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x in (-oo:+oo)
(-2/7)*x+(1/7)*x+6 = 18 // - 18
(-2/7)*x+(1/7)*x-18+6 = 0
-1/7*x-12 = 0 // + 12
-1/7*x = 12 // : -1/7
x = 12/(-1/7)
x = -84
x = -84
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