x+7+8=20

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Solution for x+7+8=20 equation: 


Simplifying
x + 7 + 8 = 20

Reorder the terms:
7 + 8 + x = 20

Combine like terms: 7 + 8 = 15
15 + x = 20

Solving
15 + x = 20

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + x = 20 + -15

Combine like terms: 15 + -15 = 0
0 + x = 20 + -15
x = 20 + -15

Combine like terms: 20 + -15 = 5
x = 5

Simplifying
x = 5

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