3-4q=2q-21

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Solution for 3-4q=2q-21 equation:


Simplifying
3 + -4q = 2q + -21

Reorder the terms:
3 + -4q = -21 + 2q

Solving
3 + -4q = -21 + 2q

Solving for variable 'q'.

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

Add '-2q' to each side of the equation.
3 + -4q + -2q = -21 + 2q + -2q

Combine like terms: -4q + -2q = -6q
3 + -6q = -21 + 2q + -2q

Combine like terms: 2q + -2q = 0
3 + -6q = -21 + 0
3 + -6q = -21

Add '-3' to each side of the equation.
3 + -3 + -6q = -21 + -3

Combine like terms: 3 + -3 = 0
0 + -6q = -21 + -3
-6q = -21 + -3

Combine like terms: -21 + -3 = -24
-6q = -24

Divide each side by '-6'.
q = 4

Simplifying
q = 4

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