3x+5x+7x=135

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Solution for 3x+5x+7x=135 equation: 



3x+5x+7x=135

We move all terms to the left:

3x+5x+7x-(135)=0

We add all the numbers together, and all the variables

15x-135=0

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

15x=135

x=135/15

x=9

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