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-0.5x+6.81=-0.7x+8.21
We move all terms to the left:
-0.5x+6.81-(-0.7x+8.21)=0
We get rid of parentheses
-0.5x+0.7x-8.21+6.81=0
We add all the numbers together, and all the variables
0.2x-1.4=0
We move all terms containing x to the left, all other terms to the right
0.2x=1.4
x=1.4/0.2
x=6+0.2/0.2
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