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(2/7)*x+9 = 87/7 // - 87/7
(2/7)*x-(87/7)+9 = 0
(2/7)*x-87/7+9 = 0
2/7*x-24/7 = 0 // + 24/7
2/7*x = 24/7 // : 2/7
x = 24/7/2/7
x = 12
x = 12
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