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x in (-oo:+oo)
(-3/7)*x+7/9 = 272/315 // - 272/315
(-3/7)*x+7/9-(272/315) = 0
(-3/7)*x+7/9-272/315 = 0
-3/7*x-3/35 = 0 // + 3/35
-3/7*x = 3/35 // : -3/7
x = 3/35/(-3/7)
x = -1/5
x = -1/5
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