45=21-3(x+3)

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Solution for 45=21-3(x+3) equation:


Simplifying
45 = 21 + -3(x + 3)

Reorder the terms:
45 = 21 + -3(3 + x)
45 = 21 + (3 * -3 + x * -3)
45 = 21 + (-9 + -3x)

Combine like terms: 21 + -9 = 12
45 = 12 + -3x

Solving
45 = 12 + -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.
45 + 3x = 12 + -3x + 3x

Combine like terms: -3x + 3x = 0
45 + 3x = 12 + 0
45 + 3x = 12

Add '-45' to each side of the equation.
45 + -45 + 3x = 12 + -45

Combine like terms: 45 + -45 = 0
0 + 3x = 12 + -45
3x = 12 + -45

Combine like terms: 12 + -45 = -33
3x = -33

Divide each side by '3'.
x = -11

Simplifying
x = -11

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