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20*x-2 = (4/7)*x // - (4/7)*x
20*x-((4/7)*x)-2 = 0
20*x+(-4/7)*x-2 = 0
136/7*x-2 = 0 // + 2
136/7*x = 2 // : 136/7
x = 2/136/7
x = 7/68
x = 7/68
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