3(x+7)-(x-15)=-84

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Solution for 3(x+7)-(x-15)=-84 equation:


Simplifying
3(x + 7) + -1(x + -15) = -84

Reorder the terms:
3(7 + x) + -1(x + -15) = -84
(7 * 3 + x * 3) + -1(x + -15) = -84
(21 + 3x) + -1(x + -15) = -84

Reorder the terms:
21 + 3x + -1(-15 + x) = -84
21 + 3x + (-15 * -1 + x * -1) = -84
21 + 3x + (15 + -1x) = -84

Reorder the terms:
21 + 15 + 3x + -1x = -84

Combine like terms: 21 + 15 = 36
36 + 3x + -1x = -84

Combine like terms: 3x + -1x = 2x
36 + 2x = -84

Solving
36 + 2x = -84

Solving for variable 'x'.

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

Add '-36' to each side of the equation.
36 + -36 + 2x = -84 + -36

Combine like terms: 36 + -36 = 0
0 + 2x = -84 + -36
2x = -84 + -36

Combine like terms: -84 + -36 = -120
2x = -120

Divide each side by '2'.
x = -60

Simplifying
x = -60

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