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2.5(u+1)-4.3=15.7
We move all terms to the left:
2.5(u+1)-4.3-(15.7)=0
We add all the numbers together, and all the variables
2.5(u+1)-20=0
We multiply parentheses
2.5u+2.5-20=0
We add all the numbers together, and all the variables
2.5u-17.5=0
We move all terms containing u to the left, all other terms to the right
2.5u=17.5
u=17.5/2.5
u=7
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