-4a+9=-2(4+5a)-7

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Solution for -4a+9=-2(4+5a)-7 equation:



-4a+9=-2(4+5a)-7
We move all terms to the left:
-4a+9-(-2(4+5a)-7)=0
We add all the numbers together, and all the variables
-4a-(-2(5a+4)-7)+9=0
We calculate terms in parentheses: -(-2(5a+4)-7), so:
-2(5a+4)-7
We multiply parentheses
-10a-8-7
We add all the numbers together, and all the variables
-10a-15
Back to the equation:
-(-10a-15)
We get rid of parentheses
-4a+10a+15+9=0
We add all the numbers together, and all the variables
6a+24=0
We move all terms containing a to the left, all other terms to the right
6a=-24
a=-24/6
a=-4

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