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\left(x+2\right)\times 2-\left(x-5\right)\times 7=-1
Variable x cannot be equal to any of the values -2,5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(x+2\right), the least common multiple of x-5,x+2,x^{2}-3x-10.
2x+4-\left(x-5\right)\times 7=-1
Use the distributive property to multiply x+2 by 2.
2x+4-\left(7x-35\right)=-1
Use the distributive property to multiply x-5 by 7.
2x+4-7x+35=-1
To find the opposite of 7x-35, find the opposite of each term.
-5x+4+35=-1
Combine 2x and -7x to get -5x.
-5x+39=-1
Add 4 and 35 to get 39.
-5x=-1-39
Subtract 39 from both sides.
-5x=-40
Subtract 39 from -1 to get -40.
x=\frac{-40}{-5}
Divide both sides by -5.
x=8
Divide -40 by -5 to get 8.