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(1/3)*(x-15)-2 = 0
1/3*(x-15)-2 = 0
1/3*(x-15)-2 = 0
1/3*x-7 = 0
1/3*x-7 = 0
1/3*x-7 = 0 // + 7
1/3*x = 7 // : 1/3
x = 7/1/3
x = 21
x = 21
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