100=10+20+10+15+x-20

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Solution for 100=10+20+10+15+x-20 equation: 


Simplifying
100 = 10 + 20 + 10 + 15 + x + -20

Reorder the terms:
100 = 10 + 20 + 10 + 15 + -20 + x

Combine like terms: 10 + 20 = 30
100 = 30 + 10 + 15 + -20 + x

Combine like terms: 30 + 10 = 40
100 = 40 + 15 + -20 + x

Combine like terms: 40 + 15 = 55
100 = 55 + -20 + x

Combine like terms: 55 + -20 = 35
100 = 35 + x

Solving
100 = 35 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
100 + -1x = 35 + x + -1x

Combine like terms: x + -1x = 0
100 + -1x = 35 + 0
100 + -1x = 35

Add '-100' to each side of the equation.
100 + -100 + -1x = 35 + -100

Combine like terms: 100 + -100 = 0
0 + -1x = 35 + -100
-1x = 35 + -100

Combine like terms: 35 + -100 = -65
-1x = -65

Divide each side by '-1'.
x = 65

Simplifying
x = 65

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