3(4x-45)+3x=90

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Solution for 3(4x-45)+3x=90 equation: 



3(4x-45)+3x=90

We move all terms to the left:

3(4x-45)+3x-(90)=0

We add all the numbers together, and all the variables

3x+3(4x-45)-90=0

We multiply parentheses

3x+12x-135-90=0

We add all the numbers together, and all the variables

15x-225=0

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

15x=225

x=225/15

x=15

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