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(1/4)*(x-2) = (1/7)*(x+1) // - (1/7)*(x+1)
(1/4)*(x-2)-((1/7)*(x+1)) = 0
(1/4)*(x-2)+(-1/7)*(x+1) = 0
1/4*(x-2)-1/7*(x+1) = 0
1/4*(x-2)-1/7*(x+1) = 0
3/28*x-9/14 = 0
3/28*x-9/14 = 0
3/28*x-9/14 = 0 // + 9/14
3/28*x = 9/14 // : 3/28
x = 9/14/3/28
x = 6
x = 6
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