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x in (-oo:+oo)
x/2-(10/2) = -7 // + 7
x/2-(10/2)+7 = 0
x/2-5+7 = 0
1/2*x+2 = 0 // - 2
1/2*x = -2 // : 1/2
x = -2/1/2
x = -4
x = -4
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