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(1/2)*x+3/5 = 30 // - 30
(1/2)*x+3/5-30 = 0
1/2*x-147/5 = 0 // + 147/5
1/2*x = 147/5 // : 1/2
x = 147/5/1/2
x = 294/5
x = 294/5
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