4x+42=90

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Solution for 4x+42=90 equation: 


Simplifying
4x + 42 = 90

Reorder the terms:
42 + 4x = 90

Solving
42 + 4x = 90

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 4x = 90 + -42

Combine like terms: 42 + -42 = 0
0 + 4x = 90 + -42
4x = 90 + -42

Combine like terms: 90 + -42 = 48
4x = 48

Divide each side by '4'.
x = 12

Simplifying
x = 12

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