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x in (-oo:+oo)
-((1/7)*x) = -4 // + 4
4-((1/7)*x) = 0
(-1/7)*x+4 = 0
4-1/7*x = 0 // - 4
-1/7*x = -4 // : -1/7
x = -4/(-1/7)
x = 28
x = 28
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