10+X+(8-1)=21

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Solution for 10+X+(8-1)=21 equation:


Simplifying
10 + X + (8 + -1) = 21

Combine like terms: 8 + -1 = 7
10 + X + (7) = 21
10 + X + 7 = 21

Reorder the terms:
10 + 7 + X = 21

Combine like terms: 10 + 7 = 17
17 + X = 21

Solving
17 + X = 21

Solving for variable 'X'.

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

Add '-17' to each side of the equation.
17 + -17 + X = 21 + -17

Combine like terms: 17 + -17 = 0
0 + X = 21 + -17
X = 21 + -17

Combine like terms: 21 + -17 = 4
X = 4

Simplifying
X = 4

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