x-30=40-(3x)

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Solution for x-30=40-(3x) equation:


Simplifying
x + -30 = 40 + -1(3x)

Reorder the terms:
-30 + x = 40 + -1(3x)

Remove parenthesis around (3x)
-30 + x = 40 + -1 * 3x

Multiply -1 * 3
-30 + x = 40 + -3x

Solving
-30 + x = 40 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-30 + x + 3x = 40 + -3x + 3x

Combine like terms: x + 3x = 4x
-30 + 4x = 40 + -3x + 3x

Combine like terms: -3x + 3x = 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 = 70
4x = 70

Divide each side by '4'.
x = 17.5

Simplifying
x = 17.5

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