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x in (-oo:+oo)
-(7*x)-7/10 = -27/10 // + -27/10
-(7*x)-7/10-(-27/10) = 0
27/10-7*x-7/10 = 0
2-7*x = 0 // - 2
-7*x = -2 // : -7
x = -2/(-7)
x = 2/7
x = 2/7
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