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x in (-oo:+oo)
2-((1/7)*x) = 5 // - 5
2-((1/7)*x)-5 = 0
(-1/7)*x-5+2 = 0
-1/7*x-3 = 0 // + 3
-1/7*x = 3 // : -1/7
x = 3/(-1/7)
x = -21
x = -21
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