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\left(2x+10\right)\times 50=70\left(10+x\right)-4000
Multiply both sides of the equation by 2.
100x+500=70\left(10+x\right)-4000
Use the distributive property to multiply 2x+10 by 50.
100x+500=700+70x-4000
Use the distributive property to multiply 70 by 10+x.
100x+500=-3300+70x
Subtract 4000 from 700 to get -3300.
100x+500-70x=-3300
Subtract 70x from both sides.
30x+500=-3300
Combine 100x and -70x to get 30x.
30x=-3300-500
Subtract 500 from both sides.
30x=-3800
Subtract 500 from -3300 to get -3800.
x=\frac{-3800}{30}
Divide both sides by 30.
x=-\frac{380}{3}
Reduce the fraction \frac{-3800}{30} to lowest terms by extracting and canceling out 10.