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(-1/3)*(12*x+3)+(1/7)*(42*x+35) = 0
1/7*(42*x+35)-1/3*(12*x+3) = 0
1/7*(42*x+35)-1/3*(12*x+3) = 0
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x = -2
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