-3(x+5)=-7x+21

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Solution for -3(x+5)=-7x+21 equation:


Simplifying
-3(x + 5) = -7x + 21

Reorder the terms:
-3(5 + x) = -7x + 21
(5 * -3 + x * -3) = -7x + 21
(-15 + -3x) = -7x + 21

Reorder the terms:
-15 + -3x = 21 + -7x

Solving
-15 + -3x = 21 + -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.
-15 + -3x + 7x = 21 + -7x + 7x

Combine like terms: -3x + 7x = 4x
-15 + 4x = 21 + -7x + 7x

Combine like terms: -7x + 7x = 0
-15 + 4x = 21 + 0
-15 + 4x = 21

Add '15' to each side of the equation.
-15 + 15 + 4x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4x = 21 + 15
4x = 21 + 15

Combine like terms: 21 + 15 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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