21-7x=1-8x

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Solution for 21-7x=1-8x equation:


Simplifying
21 + -7x = 1 + -8x

Solving
21 + -7x = 1 + -8x

Solving for variable 'x'.

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

Add '8x' to each side of the equation.
21 + -7x + 8x = 1 + -8x + 8x

Combine like terms: -7x + 8x = 1x
21 + 1x = 1 + -8x + 8x

Combine like terms: -8x + 8x = 0
21 + 1x = 1 + 0
21 + 1x = 1

Add '-21' to each side of the equation.
21 + -21 + 1x = 1 + -21

Combine like terms: 21 + -21 = 0
0 + 1x = 1 + -21
1x = 1 + -21

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

Divide each side by '1'.
x = -20

Simplifying
x = -20

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