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(-1/4)*(8*x+4)+(1/6)*(42*x+30) = 0
1/6*(42*x+30)-1/4*(8*x+4) = 0
1/6*(42*x+30)-1/4*(8*x+4) = 0
5*x+4 = 0
5*x+4 = 0
5*x+4 = 0 // - 4
5*x = -4 // : 5
x = -4/5
x = -4/5
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