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5*((3*x)/2-5) = 65 // - 65
5*((3*x)/2-5)-65 = 0
5*(3/2*x-5)-65 = 0
5*(3/2*x-5)-65 = 0
15/2*x-90 = 0
15/2*x-90 = 0
15/2*x-90 = 0 // + 90
15/2*x = 90 // : 15/2
x = 90/15/2
x = 12
x = 12
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