70+20-3a=

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Solution for 70+20-3a= equation: 


Simplifying
70 + 20 + -3a = 0

Combine like terms: 70 + 20 = 90
90 + -3a = 0

Solving
90 + -3a = 0

Solving for variable 'a'.

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

Add '-90' to each side of the equation.
90 + -90 + -3a = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -3a = 0 + -90
-3a = 0 + -90

Combine like terms: 0 + -90 = -90
-3a = -90

Divide each side by '-3'.
a = 30

Simplifying
a = 30

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