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x in (-oo:+oo)
4-((1/7)*x) = 13 // - 13
4-((1/7)*x)-13 = 0
(-1/7)*x-13+4 = 0
-1/7*x-9 = 0 // + 9
-1/7*x = 9 // : -1/7
x = 9/(-1/7)
x = -63
x = -63
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