1-3a=10

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Solution for 1-3a=10 equation: 


Simplifying
1 + -3a = 10

Solving
1 + -3a = 10

Solving for variable 'a'.

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

Add '-1' to each side of the equation.
1 + -1 + -3a = 10 + -1

Combine like terms: 1 + -1 = 0
0 + -3a = 10 + -1
-3a = 10 + -1

Combine like terms: 10 + -1 = 9
-3a = 9

Divide each side by '-3'.
a = -3

Simplifying
a = -3

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