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(1/10)*(x-1) = (1/30)*(x+1) // - (1/30)*(x+1)
(1/10)*(x-1)-((1/30)*(x+1)) = 0
(1/10)*(x-1)+(-1/30)*(x+1) = 0
1/10*(x-1)-1/30*(x+1) = 0
1/10*(x-1)-1/30*(x+1) = 0
1/15*x-2/15 = 0
1/15*x-2/15 = 0
1/15*x-2/15 = 0 // + 2/15
1/15*x = 2/15 // : 1/15
x = 2/15/1/15
x = 2
x = 2
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