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(1/5)*(2*x+3) = 3 // - 3
(1/5)*(2*x+3)-3 = 0
1/5*(2*x+3)-3 = 0
1/5*(2*x+3)-3 = 0
2/5*x-12/5 = 0
2/5*x-12/5 = 0
2/5*x-12/5 = 0 // + 12/5
2/5*x = 12/5 // : 2/5
x = 12/5/2/5
x = 6
x = 6
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