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40=g-(-20)
We move all terms to the left:
40-(g-(-20))=0
We calculate terms in parentheses: -(g-(-20)), so:We get rid of parentheses
g-(-20)
We add all the numbers together, and all the variables
g+20
Back to the equation:
-(g+20)
-g-20+40=0
We add all the numbers together, and all the variables
-1g+20=0
We move all terms containing g to the left, all other terms to the right
-g=-20
g=-20/-1
g=+20
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