3(x-1)+x=21

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Solution for 3(x-1)+x=21 equation: 


Simplifying
3(x + -1) + x = 21

Reorder the terms:
3(-1 + x) + x = 21
(-1 * 3 + x * 3) + x = 21
(-3 + 3x) + x = 21

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

Solving
-3 + 4x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 4x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 4x = 21 + 3
4x = 21 + 3

Combine like terms: 21 + 3 = 24
4x = 24

Divide each side by '4'.
x = 6

Simplifying
x = 6

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