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(1/3)*(12*x-15) = 7 // - 7
(1/3)*(12*x-15)-7 = 0
1/3*(12*x-15)-7 = 0
1/3*(12*x-15)-7 = 0
4*x-12 = 0
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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