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15=18-t/4
We move all terms to the left:
15-(18-t/4)=0
We add all the numbers together, and all the variables
-(-t/4+18)+15=0
We get rid of parentheses
t/4-18+15=0
We multiply all the terms by the denominator
t-18*4+15*4=0
We add all the numbers together, and all the variables
t-12=0
We move all terms containing t to the left, all other terms to the right
t=12
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