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4(a-2)-(2a-5)=19
We move all terms to the left:
4(a-2)-(2a-5)-(19)=0
We multiply parentheses
4a-(2a-5)-8-19=0
We get rid of parentheses
4a-2a+5-8-19=0
We add all the numbers together, and all the variables
2a-22=0
We move all terms containing a to the left, all other terms to the right
2a=22
a=22/2
a=11
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