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71.25/7.5=x
We move all terms to the left:
71.25/7.5-(x)=0
We add all the numbers together, and all the variables
-1x+71.25/7.5=0
We multiply all the terms by the denominator
-1x*7.5+71.25=0
Wy multiply elements
-7.5x+71.25=0
We move all terms containing x to the left, all other terms to the right
-7.5x=-71.25
x=-71.25/-7.5
x=9+2.1428571428571/4.2857142857143
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