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1/4-((2/7)*x) = 3/140 // - 3/140
1/4-((2/7)*x)-(3/140) = 0
(-2/7)*x+1/4-3/140 = 0
8/35-2/7*x = 0 // - 8/35
-2/7*x = -8/35 // : -2/7
x = -8/35/(-2/7)
x = 4/5
x = 4/5
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