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3x+90+(3x/2)=180
We move all terms to the left:
3x+90+(3x/2)-(180)=0
We add all the numbers together, and all the variables
3x+(+3x/2)+90-180=0
We add all the numbers together, and all the variables
3x+(+3x/2)-90=0
We get rid of parentheses
3x+3x/2-90=0
We multiply all the terms by the denominator
3x*2+3x-90*2=0
We add all the numbers together, and all the variables
3x+3x*2-180=0
Wy multiply elements
3x+6x-180=0
We add all the numbers together, and all the variables
9x-180=0
We move all terms containing x to the left, all other terms to the right
9x=180
x=180/9
x=20
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