4a+3b+42=180

Solution for 4a+3b+42=180 equation:

Simplifying
4a + 3b + 42 = 180

Reorder the terms:
42 + 4a + 3b = 180

Solving
42 + 4a + 3b = 180

Solving for variable 'a'.

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

Add '-42' to each side of the equation.
42 + 4a + -42 + 3b = 180 + -42

Reorder the terms:
42 + -42 + 4a + 3b = 180 + -42

Combine like terms: 42 + -42 = 0
0 + 4a + 3b = 180 + -42
4a + 3b = 180 + -42

Combine like terms: 180 + -42 = 138
4a + 3b = 138

Add '-3b' to each side of the equation.
4a + 3b + -3b = 138 + -3b

Combine like terms: 3b + -3b = 0
4a + 0 = 138 + -3b
4a = 138 + -3b

Divide each side by '4'.
a = 34.5 + -0.75b

Simplifying
a = 34.5 + -0.75b