21=8+1.3(x-8)

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Solution for 21=8+1.3(x-8) equation:


Simplifying
21 = 8 + 1.3(x + -8)

Reorder the terms:
21 = 8 + 1.3(-8 + x)
21 = 8 + (-8 * 1.3 + x * 1.3)
21 = 8 + (-10.4 + 1.3x)

Combine like terms: 8 + -10.4 = -2.4
21 = -2.4 + 1.3x

Solving
21 = -2.4 + 1.3x

Solving for variable 'x'.

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

Add '-1.3x' to each side of the equation.
21 + -1.3x = -2.4 + 1.3x + -1.3x

Combine like terms: 1.3x + -1.3x = 0.0
21 + -1.3x = -2.4 + 0.0
21 + -1.3x = -2.4

Add '-21' to each side of the equation.
21 + -21 + -1.3x = -2.4 + -21

Combine like terms: 21 + -21 = 0
0 + -1.3x = -2.4 + -21
-1.3x = -2.4 + -21

Combine like terms: -2.4 + -21 = -23.4
-1.3x = -23.4

Divide each side by '-1.3'.
x = 18

Simplifying
x = 18

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