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40-8x=-4(5+2x)
We move all terms to the left:
40-8x-(-4(5+2x))=0
We add all the numbers together, and all the variables
-8x-(-4(2x+5))+40=0
We calculate terms in parentheses: -(-4(2x+5)), so:We get rid of parentheses
-4(2x+5)
We multiply parentheses
-8x-20
Back to the equation:
-(-8x-20)
-8x+8x+20+40=0
We add all the numbers together, and all the variables
60!=0
There is no solution for this equation
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