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15=4t-7
We move all terms to the left:
15-(4t-7)=0
We get rid of parentheses
-4t+7+15=0
We add all the numbers together, and all the variables
-4t+22=0
We move all terms containing t to the left, all other terms to the right
-4t=-22
t=-22/-4
t=5+1/2
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