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4.2x+3.9=2.6x+39.1
We move all terms to the left:
4.2x+3.9-(2.6x+39.1)=0
We get rid of parentheses
4.2x-2.6x-39.1+3.9=0
We add all the numbers together, and all the variables
1.6x-35.2=0
We move all terms containing x to the left, all other terms to the right
1.6x=35.2
x=35.2/1.6
x=22
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