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x in (-oo:+oo)
3-((7/10)*x) = -11 // + 11
3-((7/10)*x)+11 = 0
(-7/10)*x+3+11 = 0
14-7/10*x = 0 // - 14
-7/10*x = -14 // : -7/10
x = -14/(-7/10)
x = 20
x = 20
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