x+x-30+x-30+3+40=100

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Solution for x+x-30+x-30+3+40=100 equation: 



x+x-30+x-30+3+40=100

We move all terms to the left:

x+x-30+x-30+3+40-(100)=0

We add all the numbers together, and all the variables

3x-117=0

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

3x=117

x=117/3

x=39

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