5x+21=7x+4

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Solution for 5x+21=7x+4 equation:


Simplifying
5x + 21 = 7x + 4

Reorder the terms:
21 + 5x = 7x + 4

Reorder the terms:
21 + 5x = 4 + 7x

Solving
21 + 5x = 4 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + 5x + -7x = 4 + 7x + -7x

Combine like terms: 5x + -7x = -2x
21 + -2x = 4 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -2x = 4 + 0
21 + -2x = 4

Add '-21' to each side of the equation.
21 + -21 + -2x = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 4 + -21
-2x = 4 + -21

Combine like terms: 4 + -21 = -17
-2x = -17

Divide each side by '-2'.
x = 8.5

Simplifying
x = 8.5

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