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-43 = (-2/7)*(7/10-(3*x)) // - (-2/7)*(7/10-(3*x))
-((-2/7)*(7/10-(3*x)))-43 = 0
(2/7)*(7/10-3*x)-43 = 0
2/7*(7/10-3*x)-43 = 0
2/7*(7/10-3*x)-43 = 0
-6/7*x-214/5 = 0
-6/7*x-214/5 = 0
-6/7*x-214/5 = 0 // + 214/5
-6/7*x = 214/5 // : -6/7
x = 214/5/(-6/7)
x = -749/15
x = -749/15
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