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63+0.9x=67.5+0.75x
We move all terms to the left:
63+0.9x-(67.5+0.75x)=0
We add all the numbers together, and all the variables
0.9x-(0.75x+67.5)+63=0
We get rid of parentheses
0.9x-0.75x-67.5+63=0
We add all the numbers together, and all the variables
0.15x-4.5=0
We move all terms containing x to the left, all other terms to the right
0.15x=4.5
x=4.5/0.15
x=30
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