3.5+2x=12

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Solution for 3.5+2x=12 equation: 



3.5+2x=12

We move all terms to the left:

3.5+2x-(12)=0

We add all the numbers together, and all the variables

2x-8.5=0

We move all terms containing x to the left, all other terms to the right

2x=8.5

x=8.5/2

x=4+0.5/2

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