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5*x+2*x+8 = 99/8 // - 99/8
5*x+2*x-(99/8)+8 = 0
5*x+2*x-99/8+8 = 0
7*x-35/8 = 0 // + 35/8
7*x = 35/8 // : 7
x = 35/8/7
x = 5/8
x = 5/8
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