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4x-\left(6x^{2}-x-15\right)=49-\left(6x-1\right)\left(x-2\right)
Use the distributive property to multiply 2x+3 by 3x-5 and combine like terms.
4x-6x^{2}+x+15=49-\left(6x-1\right)\left(x-2\right)
To find the opposite of 6x^{2}-x-15, find the opposite of each term.
5x-6x^{2}+15=49-\left(6x-1\right)\left(x-2\right)
Combine 4x and x to get 5x.
5x-6x^{2}+15=49-\left(6x^{2}-13x+2\right)
Use the distributive property to multiply 6x-1 by x-2 and combine like terms.
5x-6x^{2}+15=49-6x^{2}+13x-2
To find the opposite of 6x^{2}-13x+2, find the opposite of each term.
5x-6x^{2}+15=47-6x^{2}+13x
Subtract 2 from 49 to get 47.
5x-6x^{2}+15+6x^{2}=47+13x
Add 6x^{2} to both sides.
5x+15=47+13x
Combine -6x^{2} and 6x^{2} to get 0.
5x+15-13x=47
Subtract 13x from both sides.
-8x+15=47
Combine 5x and -13x to get -8x.
-8x=47-15
Subtract 15 from both sides.
-8x=32
Subtract 15 from 47 to get 32.
x=\frac{32}{-8}
Divide both sides by -8.
x=-4
Divide 32 by -8 to get -4.