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-x/4 = -1/7 // + -1/7
-x/4-(-1/7) = 0
1/7-x/4 = 0
1/7-1/4*x = 0 // - 1/7
-1/4*x = -1/7 // : -1/4
x = -1/7/(-1/4)
x = 4/7
x = 4/7
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