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