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(2/3)*x-(10/3) = 15 // - 15
(2/3)*x-(10/3)-15 = 0
(2/3)*x-10/3-15 = 0
2/3*x-55/3 = 0 // + 55/3
2/3*x = 55/3 // : 2/3
x = 55/3/2/3
x = 55/2
x = 55/2
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