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-43/5 = (-2/7)*(7/10-(3*x)) // - (-2/7)*(7/10-(3*x))
-((-2/7)*(7/10-(3*x)))-43/5 = 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
-30/7*x-42 = 0
(-30/7*x-42)/5 = 0
(-30/7*x-42)/5 = 0 // * 5
-30/7*x-42 = 0
-30/7*x-42 = 0 // + 42
-30/7*x = 42 // : -30/7
x = 42/(-30/7)
x = -49/5
x = -49/5
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