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4\left(x-3\right)^{2}-\left(2x-1\right)^{2}=35
Multiply both sides of the equation by 16, the least common multiple of 4,16.
4\left(x^{2}-6x+9\right)-\left(2x-1\right)^{2}=35
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-3\right)^{2}.
4x^{2}-24x+36-\left(2x-1\right)^{2}=35
Use the distributive property to multiply 4 by x^{2}-6x+9.
4x^{2}-24x+36-\left(4x^{2}-4x+1\right)=35
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
4x^{2}-24x+36-4x^{2}+4x-1=35
To find the opposite of 4x^{2}-4x+1, find the opposite of each term.
-24x+36+4x-1=35
Combine 4x^{2} and -4x^{2} to get 0.
-20x+36-1=35
Combine -24x and 4x to get -20x.
-20x+35=35
Subtract 1 from 36 to get 35.
-20x=35-35
Subtract 35 from both sides.
-20x=0
Subtract 35 from 35 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -20 is not equal to 0, x must be equal to 0.