3x+4x-7=21

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Solution for 3x+4x-7=21 equation: 


Simplifying
3x + 4x + -7 = 21

Reorder the terms:
-7 + 3x + 4x = 21

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

Solving
-7 + 7x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + 7 = 28
7x = 28

Divide each side by '7'.
x = 4

Simplifying
x = 4

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