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x in (-oo:+oo)
7 = (-7/10)*x-7 // - (-7/10)*x-7
7-((-7/10)*x)+7 = 0
(7/10)*x+7+7 = 0
7/10*x+14 = 0 // - 14
7/10*x = -14 // : 7/10
x = -14/7/10
x = -20
x = -20
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