20-3(x+4)=21(x+2)-7

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Solution for 20-3(x+4)=21(x+2)-7 equation:


Simplifying
20 + -3(x + 4) = 21(x + 2) + -7

Reorder the terms:
20 + -3(4 + x) = 21(x + 2) + -7
20 + (4 * -3 + x * -3) = 21(x + 2) + -7
20 + (-12 + -3x) = 21(x + 2) + -7

Combine like terms: 20 + -12 = 8
8 + -3x = 21(x + 2) + -7

Reorder the terms:
8 + -3x = 21(2 + x) + -7
8 + -3x = (2 * 21 + x * 21) + -7
8 + -3x = (42 + 21x) + -7

Reorder the terms:
8 + -3x = 42 + -7 + 21x

Combine like terms: 42 + -7 = 35
8 + -3x = 35 + 21x

Solving
8 + -3x = 35 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
8 + -3x + -21x = 35 + 21x + -21x

Combine like terms: -3x + -21x = -24x
8 + -24x = 35 + 21x + -21x

Combine like terms: 21x + -21x = 0
8 + -24x = 35 + 0
8 + -24x = 35

Add '-8' to each side of the equation.
8 + -8 + -24x = 35 + -8

Combine like terms: 8 + -8 = 0
0 + -24x = 35 + -8
-24x = 35 + -8

Combine like terms: 35 + -8 = 27
-24x = 27

Divide each side by '-24'.
x = -1.125

Simplifying
x = -1.125

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