7x+5(x-3)=81

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Solution for 7x+5(x-3)=81 equation:


Simplifying
7x + 5(x + -3) = 81

Reorder the terms:
7x + 5(-3 + x) = 81
7x + (-3 * 5 + x * 5) = 81
7x + (-15 + 5x) = 81

Reorder the terms:
-15 + 7x + 5x = 81

Combine like terms: 7x + 5x = 12x
-15 + 12x = 81

Solving
-15 + 12x = 81

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 + 12x = 81 + 15

Combine like terms: -15 + 15 = 0
0 + 12x = 81 + 15
12x = 81 + 15

Combine like terms: 81 + 15 = 96
12x = 96

Divide each side by '12'.
x = 8

Simplifying
x = 8

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