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x in (-oo:+oo)
(7/10)*x = -14/3 // + -14/3
(7/10)*x-(-14/3) = 0
(7/10)*x+14/3 = 0
7/10*x+14/3 = 0 // - 14/3
7/10*x = -14/3 // : 7/10
x = -14/3/7/10
x = -20/3
x = -20/3
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