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(2/7)*x+(3/14)*x+(1/28)*x = 30 // - 30
(2/7)*x+(3/14)*x+(1/28)*x-30 = 0
15/28*x-30 = 0 // + 30
15/28*x = 30 // : 15/28
x = 30/15/28
x = 56
x = 56
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