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50+.02t=40+.04t
We move all terms to the left:
50+.02t-(40+.04t)=0
We add all the numbers together, and all the variables
.02t-(.04t+40)+50=0
We get rid of parentheses
.02t-.04t-40+50=0
We add all the numbers together, and all the variables
-0.02t+10=0
We move all terms containing t to the left, all other terms to the right
-0.02t=-10
t=-10/-0.02
t=+500
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