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x in (-oo:+oo)
180 = (3/7)*x // - (3/7)*x
180-((3/7)*x) = 0
(-3/7)*x+180 = 0
180-3/7*x = 0 // - 180
-3/7*x = -180 // : -3/7
x = -180/(-3/7)
x = 420
x = 420
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