-100-21*5=x

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Solution for -100-21*5=x equation:


Simplifying
-100 + -21 * 5 = x

Multiply -21 * 5
-100 + -105 = x

Combine like terms: -100 + -105 = -205
-205 = x

Solving
-205 = 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.
-205 + -1x = x + -1x

Combine like terms: x + -1x = 0
-205 + -1x = 0

Add '205' to each side of the equation.
-205 + 205 + -1x = 0 + 205

Combine like terms: -205 + 205 = 0
0 + -1x = 0 + 205
-1x = 0 + 205

Combine like terms: 0 + 205 = 205
-1x = 205

Divide each side by '-1'.
x = -205

Simplifying
x = -205

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