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7.5=9.9-0.4x
We move all terms to the left:
7.5-(9.9-0.4x)=0
We add all the numbers together, and all the variables
-(-0.4x+9.9)+7.5=0
We get rid of parentheses
0.4x-9.9+7.5=0
We add all the numbers together, and all the variables
0.4x-2.4=0
We move all terms containing x to the left, all other terms to the right
0.4x=2.4
x=2.4/0.4
x=5+0.4/0.4
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