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x in (-oo:+oo)
(3/7)*x-x = 180 // - 180
(3/7)*x-x-180 = 0
-4/7*x-180 = 0 // + 180
-4/7*x = 180 // : -4/7
x = 180/(-4/7)
x = -315
x = -315
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