3x-21+4=4x-20

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Solution for 3x-21+4=4x-20 equation:


Simplifying
3x + -21 + 4 = 4x + -20

Reorder the terms:
-21 + 4 + 3x = 4x + -20

Combine like terms: -21 + 4 = -17
-17 + 3x = 4x + -20

Reorder the terms:
-17 + 3x = -20 + 4x

Solving
-17 + 3x = -20 + 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.
-17 + 3x + -4x = -20 + 4x + -4x

Combine like terms: 3x + -4x = -1x
-17 + -1x = -20 + 4x + -4x

Combine like terms: 4x + -4x = 0
-17 + -1x = -20 + 0
-17 + -1x = -20

Add '17' to each side of the equation.
-17 + 17 + -1x = -20 + 17

Combine like terms: -17 + 17 = 0
0 + -1x = -20 + 17
-1x = -20 + 17

Combine like terms: -20 + 17 = -3
-1x = -3

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

Simplifying
x = 3

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