7x+21=3x+4

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Solution for 7x+21=3x+4 equation:


Simplifying
7x + 21 = 3x + 4

Reorder the terms:
21 + 7x = 3x + 4

Reorder the terms:
21 + 7x = 4 + 3x

Solving
21 + 7x = 4 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + 7x + -3x = 4 + 3x + -3x

Combine like terms: 7x + -3x = 4x
21 + 4x = 4 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + 4x = 4 + 0
21 + 4x = 4

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

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

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

Divide each side by '4'.
x = -4.25

Simplifying
x = -4.25

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