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0.5(2a+10)=-15-3a
We move all terms to the left:
0.5(2a+10)-(-15-3a)=0
We add all the numbers together, and all the variables
0.5(2a+10)-(-3a-15)=0
We multiply parentheses
a-(-3a-15)+5=0
We get rid of parentheses
a+3a+15+5=0
We add all the numbers together, and all the variables
4a+20=0
We move all terms containing a to the left, all other terms to the right
4a=-20
a=-20/4
a=-5
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