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-a+15.4-a-8-1.2a=2-a+0.12
We move all terms to the left:
-a+15.4-a-8-1.2a-(2-a+0.12)=0
We add all the numbers together, and all the variables
-a-a-1.2a-(-1a+2.12)+15.4-8=0
We add all the numbers together, and all the variables
-3.2a-(-1a+2.12)+7.4=0
We get rid of parentheses
-3.2a+1a-2.12+7.4=0
We add all the numbers together, and all the variables
-2.2a+5.28=0
We move all terms containing a to the left, all other terms to the right
-2.2a=-5.28
a=-5.28/-2.2
a=2+0.88/2.2
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