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7*((4/21)*x-(5/7)) = 0
7*((4/21)*x-5/7) = 0
7*(4/21*x-5/7) = 0
4/21*x-5/7 = 0 // + 5/7
4/21*x = 5/7 // : 4/21
x = 5/7/4/21
x = 15/4
x = 15/4
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