8(2x+1)-4(x+5)=21

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Solution for 8(2x+1)-4(x+5)=21 equation:


Simplifying
8(2x + 1) + -4(x + 5) = 21

Reorder the terms:
8(1 + 2x) + -4(x + 5) = 21
(1 * 8 + 2x * 8) + -4(x + 5) = 21
(8 + 16x) + -4(x + 5) = 21

Reorder the terms:
8 + 16x + -4(5 + x) = 21
8 + 16x + (5 * -4 + x * -4) = 21
8 + 16x + (-20 + -4x) = 21

Reorder the terms:
8 + -20 + 16x + -4x = 21

Combine like terms: 8 + -20 = -12
-12 + 16x + -4x = 21

Combine like terms: 16x + -4x = 12x
-12 + 12x = 21

Solving
-12 + 12x = 21

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 12x = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 12x = 21 + 12
12x = 21 + 12

Combine like terms: 21 + 12 = 33
12x = 33

Divide each side by '12'.
x = 2.75

Simplifying
x = 2.75

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