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x in (-oo:+oo)
5-((2/7)*x) = -3 // + 3
3-((2/7)*x)+5 = 0
(-2/7)*x+3+5 = 0
8-2/7*x = 0 // - 8
-2/7*x = -8 // : -2/7
x = -8/(-2/7)
x = 28
x = 28
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