7x+13x=100.

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Solution for 7x+13x=100. equation: 



7x+13x=100.

We move all terms to the left:

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

We add all the numbers together, and all the variables

7x+13x-100=0

We add all the numbers together, and all the variables

20x-100=0

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

20x=100

x=100/20

x=5

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