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3*x+3*x+3/10-(1/5) = 7/10 // - 7/10
3*x+3*x+3/10-(1/5)-(7/10) = 0
3*x+3*x+3/10-1/5-7/10 = 0
6*x-3/5 = 0 // + 3/5
6*x = 3/5 // : 6
x = 3/5/6
x = 1/10
x = 1/10
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