3x-13+4x-8=21

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Solution for 3x-13+4x-8=21 equation:


Simplifying
3x + -13 + 4x + -8 = 21

Reorder the terms:
-13 + -8 + 3x + 4x = 21

Combine like terms: -13 + -8 = -21
-21 + 3x + 4x = 21

Combine like terms: 3x + 4x = 7x
-21 + 7x = 21

Solving
-21 + 7x = 21

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 7x = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 7x = 21 + 21
7x = 21 + 21

Combine like terms: 21 + 21 = 42
7x = 42

Divide each side by '7'.
x = 6

Simplifying
x = 6

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