(7x-21)+(x+4)=15

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Solution for (7x-21)+(x+4)=15 equation:


Simplifying
(7x + -21) + (x + 4) = 15

Reorder the terms:
(-21 + 7x) + (x + 4) = 15

Remove parenthesis around (-21 + 7x)
-21 + 7x + (x + 4) = 15

Reorder the terms:
-21 + 7x + (4 + x) = 15

Remove parenthesis around (4 + x)
-21 + 7x + 4 + x = 15

Reorder the terms:
-21 + 4 + 7x + x = 15

Combine like terms: -21 + 4 = -17
-17 + 7x + x = 15

Combine like terms: 7x + x = 8x
-17 + 8x = 15

Solving
-17 + 8x = 15

Solving for variable 'x'.

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

Add '17' to each side of the equation.
-17 + 17 + 8x = 15 + 17

Combine like terms: -17 + 17 = 0
0 + 8x = 15 + 17
8x = 15 + 17

Combine like terms: 15 + 17 = 32
8x = 32

Divide each side by '8'.
x = 4

Simplifying
x = 4

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