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19a+133=12(a+4)-225
We move all terms to the left:
19a+133-(12(a+4)-225)=0
We calculate terms in parentheses: -(12(a+4)-225), so:We get rid of parentheses
12(a+4)-225
We multiply parentheses
12a+48-225
We add all the numbers together, and all the variables
12a-177
Back to the equation:
-(12a-177)
19a-12a+177+133=0
We add all the numbers together, and all the variables
7a+310=0
We move all terms containing a to the left, all other terms to the right
7a=-310
a=-310/7
a=-44+2/7
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