4x+5-3x-4=21

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Solution for 4x+5-3x-4=21 equation:


Simplifying
4x + 5 + -3x + -4 = 21

Reorder the terms:
5 + -4 + 4x + -3x = 21

Combine like terms: 5 + -4 = 1
1 + 4x + -3x = 21

Combine like terms: 4x + -3x = 1x
1 + 1x = 21

Solving
1 + 1x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 1x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 1x = 21 + -1
1x = 21 + -1

Combine like terms: 21 + -1 = 20
1x = 20

Divide each side by '1'.
x = 20

Simplifying
x = 20

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