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2*x-20 = (4/7)*x // - (4/7)*x
2*x-((4/7)*x)-20 = 0
2*x+(-4/7)*x-20 = 0
10/7*x-20 = 0 // + 20
10/7*x = 20 // : 10/7
x = 20/10/7
x = 14
x = 14
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