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7*x+3*x+5/7 = 145/7 // - 145/7
7*x+3*x+5/7-(145/7) = 0
7*x+3*x+5/7-145/7 = 0
10*x-20 = 0 // + 20
10*x = 20 // : 10
x = 20/10
x = 2
x = 2
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