12x-(20+8x)=100

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Solution for 12x-(20+8x)=100 equation:


Simplifying
12x + -1(20 + 8x) = 100
12x + (20 * -1 + 8x * -1) = 100
12x + (-20 + -8x) = 100

Reorder the terms:
-20 + 12x + -8x = 100

Combine like terms: 12x + -8x = 4x
-20 + 4x = 100

Solving
-20 + 4x = 100

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + 4x = 100 + 20

Combine like terms: -20 + 20 = 0
0 + 4x = 100 + 20
4x = 100 + 20

Combine like terms: 100 + 20 = 120
4x = 120

Divide each side by '4'.
x = 30

Simplifying
x = 30

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