Question

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

Answer 1

Answer:

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

Step-by-step explanation:

Note: $\bold{":" \ Means \ The \ Mean \ Of \ Two \ Numbers}$

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

$\bold{\frac{-a}{-1}=\frac{-33}{-1}}$

Simplify

$\bold{a=33}$