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(2/3)*(x-10) = 12 // - 12
(2/3)*(x-10)-12 = 0
2/3*(x-10)-12 = 0
2/3*(x-10)-12 = 0
2/3*x-56/3 = 0
2/3*x-56/3 = 0
2/3*x-56/3 = 0 // + 56/3
2/3*x = 56/3 // : 2/3
x = 56/3/2/3
x = 28
x = 28
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