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x in (-oo:+oo)
10*(x+1/2) = 3*x+5*x+7*x // - 3*x+5*x+7*x
10*(x+1/2)-(3*x)-(5*x)-(7*x) = 0
10*(x+1/2)-3*x-5*x-7*x = 0
10*(x+1/2)-3*x-5*x-7*x = 0
7*x-5*x-7*x+5 = 0
2*x-7*x+5 = 0
5-5*x = 0
5-5*x = 0
5-5*x = 0 // - 5
-5*x = -5 // : -5
x = -5/(-5)
x = 1
x = 1
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