30=-3x+42

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Solution for 30=-3x+42 equation: 



30=-3x+42

We move all terms to the left:

30-(-3x+42)=0

We get rid of parentheses

3x-42+30=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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