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7*x+3*x+1 = 8/3 // - 8/3
7*x+3*x-(8/3)+1 = 0
7*x+3*x-8/3+1 = 0
10*x-5/3 = 0 // + 5/3
10*x = 5/3 // : 10
x = 5/3/10
x = 1/6
x = 1/6
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