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6*(-((5*x)/8)-1)-x = 4*(-((5*x)/8)-1)-7 // - 4*(-((5*x)/8)-1)-7
6*(-((5*x)/8)-1)-(4*(-((5*x)/8)-1))-x+7 = 0
6*((-5/8)*x-1)-4*((-5/8)*x-1)-x+7 = 0
6*(-5/8*x-1)-4*(-5/8*x-1)-x+7 = 0
6*(-5/8*x-1)-4*(-5/8*x-1)-x+7 = 0
7-5/4*x-x-2 = 0
7-9/4*x-2 = 0
5-9/4*x = 0
5-9/4*x = 0
5-9/4*x = 0 // - 5
-9/4*x = -5 // : -9/4
x = -5/(-9/4)
x = 20/9
x = 20/9
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