3(a-7)=42

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Solution for 3(a-7)=42 equation: 


Simplifying
3(a + -7) = 42

Reorder the terms:
3(-7 + a) = 42
(-7 * 3 + a * 3) = 42
(-21 + 3a) = 42

Solving
-21 + 3a = 42

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + 3a = 42 + 21

Combine like terms: -21 + 21 = 0
0 + 3a = 42 + 21
3a = 42 + 21

Combine like terms: 42 + 21 = 63
3a = 63

Divide each side by '3'.
a = 21

Simplifying
a = 21

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