21+3x-7(x+4)=3(x+1)-3(x-1)

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Solution for 21+3x-7(x+4)=3(x+1)-3(x-1) equation:


Simplifying
21 + 3x + -7(x + 4) = 3(x + 1) + -3(x + -1)

Reorder the terms:
21 + 3x + -7(4 + x) = 3(x + 1) + -3(x + -1)
21 + 3x + (4 * -7 + x * -7) = 3(x + 1) + -3(x + -1)
21 + 3x + (-28 + -7x) = 3(x + 1) + -3(x + -1)

Reorder the terms:
21 + -28 + 3x + -7x = 3(x + 1) + -3(x + -1)

Combine like terms: 21 + -28 = -7
-7 + 3x + -7x = 3(x + 1) + -3(x + -1)

Combine like terms: 3x + -7x = -4x
-7 + -4x = 3(x + 1) + -3(x + -1)

Reorder the terms:
-7 + -4x = 3(1 + x) + -3(x + -1)
-7 + -4x = (1 * 3 + x * 3) + -3(x + -1)
-7 + -4x = (3 + 3x) + -3(x + -1)

Reorder the terms:
-7 + -4x = 3 + 3x + -3(-1 + x)
-7 + -4x = 3 + 3x + (-1 * -3 + x * -3)
-7 + -4x = 3 + 3x + (3 + -3x)

Reorder the terms:
-7 + -4x = 3 + 3 + 3x + -3x

Combine like terms: 3 + 3 = 6
-7 + -4x = 6 + 3x + -3x

Combine like terms: 3x + -3x = 0
-7 + -4x = 6 + 0
-7 + -4x = 6

Solving
-7 + -4x = 6

Solving for variable 'x'.

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

Add '7' to each side of the equation.
-7 + 7 + -4x = 6 + 7

Combine like terms: -7 + 7 = 0
0 + -4x = 6 + 7
-4x = 6 + 7

Combine like terms: 6 + 7 = 13
-4x = 13

Divide each side by '-4'.
x = -3.25

Simplifying
x = -3.25

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