-42=7-7a

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Solution for -42=7-7a equation:


Simplifying
-42 = 7 + -7a

Solving
-42 = 7 + -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
-42 + 7a = 7 + -7a + 7a

Combine like terms: -7a + 7a = 0
-42 + 7a = 7 + 0
-42 + 7a = 7

Add '42' to each side of the equation.
-42 + 42 + 7a = 7 + 42

Combine like terms: -42 + 42 = 0
0 + 7a = 7 + 42
7a = 7 + 42

Combine like terms: 7 + 42 = 49
7a = 49

Divide each side by '7'.
a = 7

Simplifying
a = 7

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