100-7x=121-10x

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Solution for 100-7x=121-10x equation:


Simplifying
100 + -7x = 121 + -10x

Solving
100 + -7x = 121 + -10x

Solving for variable 'x'.

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

Add '10x' to each side of the equation.
100 + -7x + 10x = 121 + -10x + 10x

Combine like terms: -7x + 10x = 3x
100 + 3x = 121 + -10x + 10x

Combine like terms: -10x + 10x = 0
100 + 3x = 121 + 0
100 + 3x = 121

Add '-100' to each side of the equation.
100 + -100 + 3x = 121 + -100

Combine like terms: 100 + -100 = 0
0 + 3x = 121 + -100
3x = 121 + -100

Combine like terms: 121 + -100 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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