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13-21t=(2-3t)
We move all terms to the left:
13-21t-((2-3t))=0
We add all the numbers together, and all the variables
-21t-((-3t+2))+13=0
We calculate terms in parentheses: -((-3t+2)), so:We get rid of parentheses
(-3t+2)
We get rid of parentheses
-3t+2
Back to the equation:
-(-3t+2)
-21t+3t-2+13=0
We add all the numbers together, and all the variables
-18t+11=0
We move all terms containing t to the left, all other terms to the right
-18t=-11
t=-11/-18
t=11/18
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