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x in (-oo:+oo)
6-((2/7)*x) = -3 // + 3
3-((2/7)*x)+6 = 0
(-2/7)*x+3+6 = 0
9-2/7*x = 0 // - 9
-2/7*x = -9 // : -2/7
x = -9/(-2/7)
x = 63/2
x = 63/2
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