8-1(x+1)=-20(4-x)

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Solution for 8-1(x+1)=-20(4-x) equation:


Simplifying
8 + -1(x + 1) = -20(4 + -1x)

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

Combine like terms: 8 + -1 = 7
7 + -1x = -20(4 + -1x)
7 + -1x = (4 * -20 + -1x * -20)
7 + -1x = (-80 + 20x)

Solving
7 + -1x = -80 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
7 + -1x + -20x = -80 + 20x + -20x

Combine like terms: -1x + -20x = -21x
7 + -21x = -80 + 20x + -20x

Combine like terms: 20x + -20x = 0
7 + -21x = -80 + 0
7 + -21x = -80

Add '-7' to each side of the equation.
7 + -7 + -21x = -80 + -7

Combine like terms: 7 + -7 = 0
0 + -21x = -80 + -7
-21x = -80 + -7

Combine like terms: -80 + -7 = -87
-21x = -87

Divide each side by '-21'.
x = 4.142857143

Simplifying
x = 4.142857143

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