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(1/4)*x+2/3 = 15 // - 15
(1/4)*x+2/3-15 = 0
1/4*x-43/3 = 0 // + 43/3
1/4*x = 43/3 // : 1/4
x = 43/3/1/4
x = 172/3
x = 172/3
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