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(2/3)*(x-5) = 10 // - 10
(2/3)*(x-5)-10 = 0
2/3*(x-5)-10 = 0
2/3*(x-5)-10 = 0
2/3*x-40/3 = 0
2/3*x-40/3 = 0
2/3*x-40/3 = 0 // + 40/3
2/3*x = 40/3 // : 2/3
x = 40/3/2/3
x = 20
x = 20
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