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x in (-oo:+oo)
20 = (5/7)*x // - (5/7)*x
20-((5/7)*x) = 0
(-5/7)*x+20 = 0
20-5/7*x = 0 // - 20
-5/7*x = -20 // : -5/7
x = -20/(-5/7)
x = 28
x = 28
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