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4.2x-0.9=-1.21x-9.04
We move all terms to the left:
4.2x-0.9-(-1.21x-9.04)=0
We get rid of parentheses
4.2x+1.21x+9.04-0.9=0
We add all the numbers together, and all the variables
5.41x+8.14=0
We move all terms containing x to the left, all other terms to the right
5.41x=-8.14
x=-8.14/5.41
x=-1+2.73/5.41
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