30=8x+40-4x

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Solution for 30=8x+40-4x equation:


Simplifying
30 = 8x + 40 + -4x

Reorder the terms:
30 = 40 + 8x + -4x

Combine like terms: 8x + -4x = 4x
30 = 40 + 4x

Solving
30 = 40 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
30 + -4x = 40 + 4x + -4x

Combine like terms: 4x + -4x = 0
30 + -4x = 40 + 0
30 + -4x = 40

Add '-30' to each side of the equation.
30 + -30 + -4x = 40 + -30

Combine like terms: 30 + -30 = 0
0 + -4x = 40 + -30
-4x = 40 + -30

Combine like terms: 40 + -30 = 10
-4x = 10

Divide each side by '-4'.
x = -2.5

Simplifying
x = -2.5

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