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180=(90+3t)
We move all terms to the left:
180-((90+3t))=0
We add all the numbers together, and all the variables
-((3t+90))+180=0
We calculate terms in parentheses: -((3t+90)), so:We get rid of parentheses
(3t+90)
We get rid of parentheses
3t+90
Back to the equation:
-(3t+90)
-3t-90+180=0
We add all the numbers together, and all the variables
-3t+90=0
We move all terms containing t to the left, all other terms to the right
-3t=-90
t=-90/-3
t=+30
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