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(2/3)*(21*x-15) = 186 // - 186
(2/3)*(21*x-15)-186 = 0
2/3*(21*x-15)-186 = 0
2/3*(21*x-15)-186 = 0
14*x-196 = 0
14*x-196 = 0
14*x-196 = 0 // + 196
14*x = 196 // : 14
x = 196/14
x = 14
x = 14
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