6x-3=4x+21=90

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Solution for 6x-3=4x+21=90 equation: 



6x-3=4x+21=90

We move all terms to the left:

6x-3-(4x+21)=0

We get rid of parentheses

6x-4x-21-3=0

We add all the numbers together, and all the variables

2x-24=0

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

2x=24

x=24/2

x=12

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