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(3/10)*(4*x-7) = (-3/5)*x // - (-3/5)*x
(3/10)*(4*x-7)-((-3/5)*x) = 0
(3/10)*(4*x-7)+(3/5)*x = 0
3/10*(4*x-7)+(3*x)/5 = 0
(3/10*5*(4*x-7))/5+(3*x)/5 = 0
3/10*5*(4*x-7)+3*x = 0
9*x-21/2 = 0
(9*x-21/2)/5 = 0
(9*x-21/2)/5 = 0 // * 5
9*x-21/2 = 0
9*x-21/2 = 0 // + 21/2
9*x = 21/2 // : 9
x = 21/2/9
x = 7/6
x = 7/6
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