7x+21=8x-4

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Solution for 7x+21=8x-4 equation:


Simplifying
7x + 21 = 8x + -4

Reorder the terms:
21 + 7x = 8x + -4

Reorder the terms:
21 + 7x = -4 + 8x

Solving
21 + 7x = -4 + 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 = -4 + 8x + -8x

Combine like terms: 7x + -8x = -1x
21 + -1x = -4 + 8x + -8x

Combine like terms: 8x + -8x = 0
21 + -1x = -4 + 0
21 + -1x = -4

Add '-21' to each side of the equation.
21 + -21 + -1x = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = -4 + -21
-1x = -4 + -21

Combine like terms: -4 + -21 = -25
-1x = -25

Divide each side by '-1'.
x = 25

Simplifying
x = 25

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