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(-4/7)*(3*x+9)-((1/7)*(6*x+8)) = 0
(-4/7)*(3*x+9)+(-1/7)*(6*x+8) = 0
-4/7*(3*x+9)-1/7*(6*x+8) = 0
-4/7*(3*x+9)-1/7*(6*x+8) = 0
-18/7*x-44/7 = 0
-18/7*x-44/7 = 0
-18/7*x-44/7 = 0 // + 44/7
-18/7*x = 44/7 // : -18/7
x = 44/7/(-18/7)
x = -22/9
x = -22/9
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