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100+.75x=257.50
We move all terms to the left:
100+.75x-(257.50)=0
We add all the numbers together, and all the variables
.75x+100-(257.5)=0
We add all the numbers together, and all the variables
.75x-157.5=0
We move all terms containing x to the left, all other terms to the right
.75x=157.5
x=157.5/.75
x=210
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