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15=t+2+4
We move all terms to the left:
15-(t+2+4)=0
We add all the numbers together, and all the variables
-(t+6)+15=0
We get rid of parentheses
-t-6+15=0
We add all the numbers together, and all the variables
-1t+9=0
We move all terms containing t to the left, all other terms to the right
-t=-9
t=-9/-1
t=+9
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