7x-21=2x+3(5x+3)

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Solution for 7x-21=2x+3(5x+3) equation:


Simplifying
7x + -21 = 2x + 3(5x + 3)

Reorder the terms:
-21 + 7x = 2x + 3(5x + 3)

Reorder the terms:
-21 + 7x = 2x + 3(3 + 5x)
-21 + 7x = 2x + (3 * 3 + 5x * 3)
-21 + 7x = 2x + (9 + 15x)

Reorder the terms:
-21 + 7x = 9 + 2x + 15x

Combine like terms: 2x + 15x = 17x
-21 + 7x = 9 + 17x

Solving
-21 + 7x = 9 + 17x

Solving for variable 'x'.

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

Add '-17x' to each side of the equation.
-21 + 7x + -17x = 9 + 17x + -17x

Combine like terms: 7x + -17x = -10x
-21 + -10x = 9 + 17x + -17x

Combine like terms: 17x + -17x = 0
-21 + -10x = 9 + 0
-21 + -10x = 9

Add '21' to each side of the equation.
-21 + 21 + -10x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -10x = 9 + 21
-10x = 9 + 21

Combine like terms: 9 + 21 = 30
-10x = 30

Divide each side by '-10'.
x = -3

Simplifying
x = -3

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