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