10x-3(2x+5)=21

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Solution for 10x-3(2x+5)=21 equation:


Simplifying
10x + -3(2x + 5) = 21

Reorder the terms:
10x + -3(5 + 2x) = 21
10x + (5 * -3 + 2x * -3) = 21
10x + (-15 + -6x) = 21

Reorder the terms:
-15 + 10x + -6x = 21

Combine like terms: 10x + -6x = 4x
-15 + 4x = 21

Solving
-15 + 4x = 21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 4x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4x = 21 + 15
4x = 21 + 15

Combine like terms: 21 + 15 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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