13+8(5x-9)=21

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Solution for 13+8(5x-9)=21 equation:


Simplifying
13 + 8(5x + -9) = 21

Reorder the terms:
13 + 8(-9 + 5x) = 21
13 + (-9 * 8 + 5x * 8) = 21
13 + (-72 + 40x) = 21

Combine like terms: 13 + -72 = -59
-59 + 40x = 21

Solving
-59 + 40x = 21

Solving for variable 'x'.

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

Add '59' to each side of the equation.
-59 + 59 + 40x = 21 + 59

Combine like terms: -59 + 59 = 0
0 + 40x = 21 + 59
40x = 21 + 59

Combine like terms: 21 + 59 = 80
40x = 80

Divide each side by '40'.
x = 2

Simplifying
x = 2

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