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(7/10)*((6/10)*x+4/10)-((3/10)*((7/10)*x-(9/10)))-((1/10)*x) = 0
(7/10)*((6/10)*x+4/10)+(-3/10)*((7/10)*x-9/10)+(-1/10)*x = 0
7/10*(3/5*x+2/5)-3/10*(7/10*x-9/10)-x/10 = 0
(7/10*10*(3/5*x+2/5))/10+(-3/10*10*(7/10*x-9/10))/10-x/10 = 0
7/10*10*(3/5*x+2/5)-3/10*10*(7/10*x-9/10)-x = 0
21/10*x-x+11/2 = 0
11/10*x+11/2 = 0
(11/10*x+11/2)/10 = 0
(11/10*x+11/2)/10 = 0 // * 10
11/10*x+11/2 = 0
11/10*x+11/2 = 0 // - 11/2
11/10*x = -11/2 // : 11/10
x = -11/2/11/10
x = -5
x = -5
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