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2/5-x+21=-1/5(8x-25)-2x
We move all terms to the left:
2/5-x+21-(-1/5(8x-25)-2x)=0
Domain of the equation: 5(8x-25)-2x)!=0We add all the numbers together, and all the variables
x∈R
-1x-(-1/5(8x-25)-2x)+21+2/5=0
We calculate fractions
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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