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x in (-oo:+oo)
(-2/7)*x = 3/4 // - 3/4
(-2/7)*x-(3/4) = 0
(-2/7)*x-3/4 = 0
-2/7*x-3/4 = 0 // + 3/4
-2/7*x = 3/4 // : -2/7
x = 3/4/(-2/7)
x = -21/8
x = -21/8
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