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12.50x+30=7.50x+90.50
We move all terms to the left:
12.50x+30-(7.50x+90.50)=0
We add all the numbers together, and all the variables
12.50x-(7.50x+90.5)+30=0
We get rid of parentheses
12.50x-7.50x-90.5+30=0
We add all the numbers together, and all the variables
5x-60.5=0
We move all terms containing x to the left, all other terms to the right
5x=60.5
x=60.5/5
x=12+0.5/5
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