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\left(3x-1\right)\left(1+2x\right)-x\times 6x-4=0
Variable x cannot be equal to any of the values 0,\frac{1}{3} since division by zero is not defined. Multiply both sides of the equation by x\left(3x-1\right), the least common multiple of x,3x-1,x-3x^{2}.
x+6x^{2}-1-x\times 6x-4=0
Use the distributive property to multiply 3x-1 by 1+2x and combine like terms.
x+6x^{2}-1-x^{2}\times 6-4=0
Multiply x and x to get x^{2}.
x+6x^{2}-5-x^{2}\times 6=0
Subtract 4 from -1 to get -5.
x+6x^{2}-x^{2}\times 6=5
Add 5 to both sides. Anything plus zero gives itself.
x+6x^{2}-6x^{2}=5
Multiply -1 and 6 to get -6.
x=5
Combine 6x^{2} and -6x^{2} to get 0.