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2-x = (1/2)*(4-x)-((1/7)*(4*x-8)) // - (1/2)*(4-x)-((1/7)*(4*x-8))
(1/7)*(4*x-8)-((1/2)*(4-x))-x+2 = 0
(-1/2)*(4-x)+(1/7)*(4*x-8)-x+2 = 0
1/7*(4*x-8)-1/2*(4-x)-x+2 = 0
1/7*(4*x-8)-1/2*(4-x)-x+2 = 0
15/14*x-x-22/7+2 = 0
1/14*x-22/7+2 = 0
1/14*x-8/7 = 0
1/14*x-8/7 = 0
1/14*x-8/7 = 0 // + 8/7
1/14*x = 8/7 // : 1/14
x = 8/7/1/14
x = 16
x = 16
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