x+10+20=90

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Solution for x+10+20=90 equation: 


Simplifying
x + 10 + 20 = 90

Reorder the terms:
10 + 20 + x = 90

Combine like terms: 10 + 20 = 30
30 + x = 90

Solving
30 + x = 90

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + x = 90 + -30

Combine like terms: 30 + -30 = 0
0 + x = 90 + -30
x = 90 + -30

Combine like terms: 90 + -30 = 60
x = 60

Simplifying
x = 60

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