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59+40t=-21+30t
We move all terms to the left:
59+40t-(-21+30t)=0
We add all the numbers together, and all the variables
40t-(30t-21)+59=0
We get rid of parentheses
40t-30t+21+59=0
We add all the numbers together, and all the variables
10t+80=0
We move all terms containing t to the left, all other terms to the right
10t=-80
t=-80/10
t=-8
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