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x in (-oo:+oo)
(1/10)*x = (4/5)*x-7 // - (4/5)*x-7
(1/10)*x-((4/5)*x)+7 = 0
(1/10)*x+(-4/5)*x+7 = 0
7-7/10*x = 0 // - 7
-7/10*x = -7 // : -7/10
x = -7/(-7/10)
x = 10
x = 10
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