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9-7*x = (-4/7)*x+351/49 // - (-4/7)*x+351/49
9-7*x-((-4/7)*x)-(351/49) = 0
(4/7)*x-7*x-351/49+9 = 0
90/49-45/7*x = 0 // - 90/49
-45/7*x = -90/49 // : -45/7
x = -90/49/(-45/7)
x = 2/7
x = 2/7
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