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x in (-oo:+oo)
(-3/7)*x+(2/7)*x+9 = 71/7 // - 71/7
(-3/7)*x+(2/7)*x-(71/7)+9 = 0
(-3/7)*x+(2/7)*x-71/7+9 = 0
-1/7*x-8/7 = 0 // + 8/7
-1/7*x = 8/7 // : -1/7
x = 8/7/(-1/7)
x = -8
x = -8
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