20=4(x-2)-(x-7)

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Solution for 20=4(x-2)-(x-7) equation:


Simplifying
20 = 4(x + -2) + -1(x + -7)

Reorder the terms:
20 = 4(-2 + x) + -1(x + -7)
20 = (-2 * 4 + x * 4) + -1(x + -7)
20 = (-8 + 4x) + -1(x + -7)

Reorder the terms:
20 = -8 + 4x + -1(-7 + x)
20 = -8 + 4x + (-7 * -1 + x * -1)
20 = -8 + 4x + (7 + -1x)

Reorder the terms:
20 = -8 + 7 + 4x + -1x

Combine like terms: -8 + 7 = -1
20 = -1 + 4x + -1x

Combine like terms: 4x + -1x = 3x
20 = -1 + 3x

Solving
20 = -1 + 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.
20 + -3x = -1 + 3x + -3x

Combine like terms: 3x + -3x = 0
20 + -3x = -1 + 0
20 + -3x = -1

Add '-20' to each side of the equation.
20 + -20 + -3x = -1 + -20

Combine like terms: 20 + -20 = 0
0 + -3x = -1 + -20
-3x = -1 + -20

Combine like terms: -1 + -20 = -21
-3x = -21

Divide each side by '-3'.
x = 7

Simplifying
x = 7

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