3+4x+5=21

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


Simplifying
3 + 4x + 5 = 21

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

Combine like terms: 3 + 5 = 8
8 + 4x = 21

Solving
8 + 4x = 21

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 4x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 4x = 21 + -8
4x = 21 + -8

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

Divide each side by '4'.
x = 3.25

Simplifying
x = 3.25

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