15x+21(x-2)=138

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Solution for 15x+21(x-2)=138 equation:


Simplifying
15x + 21(x + -2) = 138

Reorder the terms:
15x + 21(-2 + x) = 138
15x + (-2 * 21 + x * 21) = 138
15x + (-42 + 21x) = 138

Reorder the terms:
-42 + 15x + 21x = 138

Combine like terms: 15x + 21x = 36x
-42 + 36x = 138

Solving
-42 + 36x = 138

Solving for variable 'x'.

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

Add '42' to each side of the equation.
-42 + 42 + 36x = 138 + 42

Combine like terms: -42 + 42 = 0
0 + 36x = 138 + 42
36x = 138 + 42

Combine like terms: 138 + 42 = 180
36x = 180

Divide each side by '36'.
x = 5

Simplifying
x = 5

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