Question

48x3 - a + (9:3 + 15)= 129

Answer 1

`\boxed{\bold{a=33}}`

Explanation:

Note:
`\bold{`

Mean Of 9 & 3: 3

Rewrite Equation

`\bold{48\cdot 3\:-\:a\:+\:\left(3\:+\:15\right)=\:129}`

Remove Parenthesis: (a) = a

`\bold{48\cdot \:3-a+3+15=129}`

Multiply Numbers:
`\bold{48\cdot \:3=144}`

`\bold{144-a+3+15=129}`

Group Like Terms

`\bold{-a+144+3+15=129}`

Add The Numbers:
`\bold{144+3+15=162}`

`\bold{-a+162=129}`

Subtract 162 From Both Sides

`\bold{-a+162-162=129-162}`

Simplify

`\bold{-a=-33}`

Divide Both Sides By -1

`\bold{(-a)/(-1)=(-33)/(-1)}`

Simplify

`\bold{a=33}`