10+15-x=21

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Solution for 10+15-x=21 equation:


Simplifying
10 + 15 + -1x = 21

Combine like terms: 10 + 15 = 25
25 + -1x = 21

Solving
25 + -1x = 21

Solving for variable 'x'.

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

Add '-25' to each side of the equation.
25 + -25 + -1x = 21 + -25

Combine like terms: 25 + -25 = 0
0 + -1x = 21 + -25
-1x = 21 + -25

Combine like terms: 21 + -25 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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