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x in (-oo:+oo)
10 = -x/2 // + -x/2
10-(-x/2) = 0
(1/2)*x+10 = 0
1/2*x+10 = 0 // - 10
1/2*x = -10 // : 1/2
x = -10/1/2
x = -20
x = -20
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