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300x+(50*2x)=180
We move all terms to the left:
300x+(50*2x)-(180)=0
We add all the numbers together, and all the variables
300x+(+50*2x)-180=0
We get rid of parentheses
300x+50*2x-180=0
Wy multiply elements
300x+100x-180=0
We add all the numbers together, and all the variables
400x-180=0
We move all terms containing x to the left, all other terms to the right
400x=180
x=180/400
x=9/20
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