7x-30-5x=20

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Solution for 7x-30-5x=20 equation: 



7x-30-5x=20

We move all terms to the left:

7x-30-5x-(20)=0

We add all the numbers together, and all the variables

2x-50=0

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

2x=50

x=50/2

x=25

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