40=2(15-x)+4

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Solution for 40=2(15-x)+4 equation:


Simplifying
40 = 2(15 + -1x) + 4
40 = (15 * 2 + -1x * 2) + 4
40 = (30 + -2x) + 4

Reorder the terms:
40 = 30 + 4 + -2x

Combine like terms: 30 + 4 = 34
40 = 34 + -2x

Solving
40 = 34 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
40 + 2x = 34 + -2x + 2x

Combine like terms: -2x + 2x = 0
40 + 2x = 34 + 0
40 + 2x = 34

Add '-40' to each side of the equation.
40 + -40 + 2x = 34 + -40

Combine like terms: 40 + -40 = 0
0 + 2x = 34 + -40
2x = 34 + -40

Combine like terms: 34 + -40 = -6
2x = -6

Divide each side by '2'.
x = -3

Simplifying
x = -3

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