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(-3/4)*(3*x+7)+(1/4)*(12*x+20) = 0
1/4*(12*x+20)-3/4*(3*x+7) = 0
1/4*(12*x+20)-3/4*(3*x+7) = 0
3/4*x-1/4 = 0
3/4*x-1/4 = 0
3/4*x-1/4 = 0 // + 1/4
3/4*x = 1/4 // : 3/4
x = 1/4/3/4
x = 1/3
x = 1/3
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