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90+(t+10.5)+2t=280
We move all terms to the left:
90+(t+10.5)+2t-(280)=0
We add all the numbers together, and all the variables
2t+(t+10.5)-190=0
We get rid of parentheses
2t+t+10.5-190=0
We add all the numbers together, and all the variables
3t-179.5=0
We move all terms containing t to the left, all other terms to the right
3t=179.5
t=179.5/3
t=59+2.5/3
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