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x in (-oo:+oo)
(1/5)*x-((9/10)*x) = 10-73 // - 10-73
(1/5)*x-((9/10)*x)-10+73 = 0
(1/5)*x+(-9/10)*x-10+73 = 0
63-7/10*x = 0 // - 63
-7/10*x = -63 // : -7/10
x = -63/(-7/10)
x = 90
x = 90
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