20-X+15=7

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Solution for 20-X+15=7 equation:


Simplifying
20 + -1X + 15 = 7

Reorder the terms:
20 + 15 + -1X = 7

Combine like terms: 20 + 15 = 35
35 + -1X = 7

Solving
35 + -1X = 7

Solving for variable 'X'.

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

Add '-35' to each side of the equation.
35 + -35 + -1X = 7 + -35

Combine like terms: 35 + -35 = 0
0 + -1X = 7 + -35
-1X = 7 + -35

Combine like terms: 7 + -35 = -28
-1X = -28

Divide each side by '-1'.
X = 28

Simplifying
X = 28

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