2x-3(x+4)=21

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Solution for 2x-3(x+4)=21 equation:


Simplifying
2x + -3(x + 4) = 21

Reorder the terms:
2x + -3(4 + x) = 21
2x + (4 * -3 + x * -3) = 21
2x + (-12 + -3x) = 21

Reorder the terms:
-12 + 2x + -3x = 21

Combine like terms: 2x + -3x = -1x
-12 + -1x = 21

Solving
-12 + -1x = 21

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + -1x = 21 + 12

Combine like terms: -12 + 12 = 0
0 + -1x = 21 + 12
-1x = 21 + 12

Combine like terms: 21 + 12 = 33
-1x = 33

Divide each side by '-1'.
x = -33

Simplifying
x = -33

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