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5*x+7*x+1 = -41/7 // + -41/7
5*x+7*x-(-41/7)+1 = 0
5*x+7*x+41/7+1 = 0
12*x+48/7 = 0 // - 48/7
12*x = -48/7 // : 12
x = -48/7/12
x = -4/7
x = -4/7
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