3x=90-87

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Solution for 3x=90-87 equation: 



3x=90-87

We move all terms to the left:

3x-(90-87)=0

We add all the numbers together, and all the variables

3x-3=0

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

3x=3

x=3/3

x=1

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