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10(28+b)+15(5)=495
We move all terms to the left:
10(28+b)+15(5)-(495)=0
We add all the numbers together, and all the variables
10(b+28)+155-495=0
We add all the numbers together, and all the variables
10(b+28)-340=0
We multiply parentheses
10b+280-340=0
We add all the numbers together, and all the variables
10b-60=0
We move all terms containing b to the left, all other terms to the right
10b=60
b=60/10
b=6
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