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(15*x)/5 = 5*(3*a-2) // - 5*(3*a-2)
(15*x)/5-(5*(3*a-2)) = 0
(15*x)/5-5*(3*a-2) = 0
3*x-5*(3*a-2) = 0
3*x-5*(3*a-2) = 0
3*x-15*a+10 = 0
3*x-15*a+10 = 0
3*x-15*a+10 = 0 // - 10-15*a
3*x = -(10-15*a) // : 3
x = (-(10-15*a))/3
x = (-(10-15*a))/3
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