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a=180(4-2)/4
We move all terms to the left:
a-(180(4-2)/4)=0
We add all the numbers together, and all the variables
a-(1802/4)=0
We get rid of parentheses
a-1802/4=0
We multiply all the terms by the denominator
a*4-1802=0
Wy multiply elements
4a-1802=0
We move all terms containing a to the left, all other terms to the right
4a=1802
a=1802/4
a=450+1/2
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