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-5+25x+5\left(-8x-2\right)=-4x-8x
Use the distributive property to multiply -5 by 1-5x.
-5+25x-40x-10=-4x-8x
Use the distributive property to multiply 5 by -8x-2.
-5-15x-10=-4x-8x
Combine 25x and -40x to get -15x.
-15-15x=-4x-8x
Subtract 10 from -5 to get -15.
-15-15x=-12x
Combine -4x and -8x to get -12x.
-15-15x+12x=0
Add 12x to both sides.
-15-3x=0
Combine -15x and 12x to get -3x.
-3x=15
Add 15 to both sides. Anything plus zero gives itself.
x=\frac{15}{-3}
Divide both sides by -3.
x=-5
Divide 15 by -3 to get -5.