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(2/5)*(x-(1/3))+(1/2)*(x+2) = (7/10)*(x-(4/7)) // - (7/10)*(x-(4/7))
(2/5)*(x-(1/3))+(1/2)*(x+2)-((7/10)*(x-(4/7))) = 0
(2/5)*(x-1/3)+(1/2)*(x+2)+(-7/10)*(x-4/7) = 0
2/5*(x-1/3)+1/2*(x+2)-7/10*(x-4/7) = 0
2/5*(x-1/3)+1/2*(x+2)-7/10*(x-4/7) = 0
9/10*x-7/10*x+2/5+13/15 = 0
1/5*x+19/15 = 0
1/5*x+19/15 = 0
1/5*x+19/15 = 0 // - 19/15
1/5*x = -19/15 // : 1/5
x = -19/15/1/5
x = -19/3
x = -19/3
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