-10x-9(1)=90

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Solution for -10x-9(1)=90 equation: 


Simplifying
-10x + -9(1) = 90

Multiply -9 * 1
-10x + -9 = 90

Reorder the terms:
-9 + -10x = 90

Solving
-9 + -10x = 90

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + -10x = 90 + 9

Combine like terms: -9 + 9 = 0
0 + -10x = 90 + 9
-10x = 90 + 9

Combine like terms: 90 + 9 = 99
-10x = 99

Divide each side by '-10'.
x = -9.9

Simplifying
x = -9.9

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