7x+2(-8x+21)=15

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Solution for 7x+2(-8x+21)=15 equation:


Simplifying
7x + 2(-8x + 21) = 15

Reorder the terms:
7x + 2(21 + -8x) = 15
7x + (21 * 2 + -8x * 2) = 15
7x + (42 + -16x) = 15

Reorder the terms:
42 + 7x + -16x = 15

Combine like terms: 7x + -16x = -9x
42 + -9x = 15

Solving
42 + -9x = 15

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + -9x = 15 + -42

Combine like terms: 42 + -42 = 0
0 + -9x = 15 + -42
-9x = 15 + -42

Combine like terms: 15 + -42 = -27
-9x = -27

Divide each side by '-9'.
x = 3

Simplifying
x = 3

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