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x in (-oo:+oo)
(1/2)*(5-35) = -10*x // + -10*x
(1/2)*(5-35)-(-10*x) = 0
10*x+(1/2)*(5-35) = 0
10*x-15 = 0 // + 15
10*x = 15 // : 10
x = 15/10
x = 3/2
x = 3/2
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