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43/5 = (-2/7)*(7/10-(3*x)) // - (-2/7)*(7/10-(3*x))
43/5-((-2/7)*(7/10-(3*x))) = 0
(2/7)*(7/10-3*x)+43/5 = 0
2/7*(7/10-3*x)+43/5 = 0
(2/7*5*(7/10-3*x))/5+43/5 = 0
2/7*5*(7/10-3*x)+43 = 0
44-30/7*x = 0
(44-30/7*x)/5 = 0
(44-30/7*x)/5 = 0 // * 5
44-30/7*x = 0
44-30/7*x = 0 // - 44
-30/7*x = -44 // : -30/7
x = -44/(-30/7)
x = 154/15
x = 154/15
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