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x in (-oo:+oo)
2*x = (1/2)*x-7 // - (1/2)*x-7
2*x-((1/2)*x)+7 = 0
2*x+(-1/2)*x+7 = 0
3/2*x+7 = 0 // - 7
3/2*x = -7 // : 3/2
x = -7/3/2
x = -14/3
x = -14/3
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