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x in (-oo:+oo)
(-3/7)*x = -9/28 // + -9/28
(-3/7)*x-(-9/28) = 0
(-3/7)*x+9/28 = 0
9/28-3/7*x = 0 // - 9/28
-3/7*x = -9/28 // : -3/7
x = -9/28/(-3/7)
x = 3/4
x = 3/4
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