3x+42=4x+45

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Solution for 3x+42=4x+45 equation:


Simplifying
3x + 42 = 4x + 45

Reorder the terms:
42 + 3x = 4x + 45

Reorder the terms:
42 + 3x = 45 + 4x

Solving
42 + 3x = 45 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
42 + 3x + -4x = 45 + 4x + -4x

Combine like terms: 3x + -4x = -1x
42 + -1x = 45 + 4x + -4x

Combine like terms: 4x + -4x = 0
42 + -1x = 45 + 0
42 + -1x = 45

Add '-42' to each side of the equation.
42 + -42 + -1x = 45 + -42

Combine like terms: 42 + -42 = 0
0 + -1x = 45 + -42
-1x = 45 + -42

Combine like terms: 45 + -42 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

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