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x in (-oo:+oo)
45 = (5/10)*x // - (5/10)*x
45-((5/10)*x) = 0
(-1/2)*x+45 = 0
45-1/2*x = 0 // - 45
-1/2*x = -45 // : -1/2
x = -45/(-1/2)
x = 90
x = 90
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