7(x+1)-3(x+2)=81

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Solution for 7(x+1)-3(x+2)=81 equation:


Simplifying
7(x + 1) + -3(x + 2) = 81

Reorder the terms:
7(1 + x) + -3(x + 2) = 81
(1 * 7 + x * 7) + -3(x + 2) = 81
(7 + 7x) + -3(x + 2) = 81

Reorder the terms:
7 + 7x + -3(2 + x) = 81
7 + 7x + (2 * -3 + x * -3) = 81
7 + 7x + (-6 + -3x) = 81

Reorder the terms:
7 + -6 + 7x + -3x = 81

Combine like terms: 7 + -6 = 1
1 + 7x + -3x = 81

Combine like terms: 7x + -3x = 4x
1 + 4x = 81

Solving
1 + 4x = 81

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 + 4x = 81 + -1

Combine like terms: 1 + -1 = 0
0 + 4x = 81 + -1
4x = 81 + -1

Combine like terms: 81 + -1 = 80
4x = 80

Divide each side by '4'.
x = 20

Simplifying
x = 20

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