3(x+2)-5(2x+1)=21

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Solution for 3(x+2)-5(2x+1)=21 equation:


Simplifying
3(x + 2) + -5(2x + 1) = 21

Reorder the terms:
3(2 + x) + -5(2x + 1) = 21
(2 * 3 + x * 3) + -5(2x + 1) = 21
(6 + 3x) + -5(2x + 1) = 21

Reorder the terms:
6 + 3x + -5(1 + 2x) = 21
6 + 3x + (1 * -5 + 2x * -5) = 21
6 + 3x + (-5 + -10x) = 21

Reorder the terms:
6 + -5 + 3x + -10x = 21

Combine like terms: 6 + -5 = 1
1 + 3x + -10x = 21

Combine like terms: 3x + -10x = -7x
1 + -7x = 21

Solving
1 + -7x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + -7x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + -7x = 21 + -1
-7x = 21 + -1

Combine like terms: 21 + -1 = 20
-7x = 20

Divide each side by '-7'.
x = -2.857142857

Simplifying
x = -2.857142857

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