12a+90=31a-100

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Solution for 12a+90=31a-100 equation:


Simplifying
12a + 90 = 31a + -100

Reorder the terms:
90 + 12a = 31a + -100

Reorder the terms:
90 + 12a = -100 + 31a

Solving
90 + 12a = -100 + 31a

Solving for variable 'a'.

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

Add '-31a' to each side of the equation.
90 + 12a + -31a = -100 + 31a + -31a

Combine like terms: 12a + -31a = -19a
90 + -19a = -100 + 31a + -31a

Combine like terms: 31a + -31a = 0
90 + -19a = -100 + 0
90 + -19a = -100

Add '-90' to each side of the equation.
90 + -90 + -19a = -100 + -90

Combine like terms: 90 + -90 = 0
0 + -19a = -100 + -90
-19a = -100 + -90

Combine like terms: -100 + -90 = -190
-19a = -190

Divide each side by '-19'.
a = 10

Simplifying
a = 10

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