8x+5x-40=100-7x

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Solution for 8x+5x-40=100-7x equation: 



8x+5x-40=100-7x

We move all terms to the left:

8x+5x-40-(100-7x)=0

We add all the numbers together, and all the variables

8x+5x-(-7x+100)-40=0

We add all the numbers together, and all the variables

13x-(-7x+100)-40=0

We get rid of parentheses

13x+7x-100-40=0

We add all the numbers together, and all the variables

20x-140=0

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

20x=140

x=140/20

x=7

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