3(x+1)+4(x-3)=12

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Solution for 3(x+1)+4(x-3)=12 equation:


Simplifying
3(x + 1) + 4(x + -3) = 12

Reorder the terms:
3(1 + x) + 4(x + -3) = 12
(1 * 3 + x * 3) + 4(x + -3) = 12
(3 + 3x) + 4(x + -3) = 12

Reorder the terms:
3 + 3x + 4(-3 + x) = 12
3 + 3x + (-3 * 4 + x * 4) = 12
3 + 3x + (-12 + 4x) = 12

Reorder the terms:
3 + -12 + 3x + 4x = 12

Combine like terms: 3 + -12 = -9
-9 + 3x + 4x = 12

Combine like terms: 3x + 4x = 7x
-9 + 7x = 12

Solving
-9 + 7x = 12

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 7x = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 7x = 12 + 9
7x = 12 + 9

Combine like terms: 12 + 9 = 21
7x = 21

Divide each side by '7'.
x = 3

Simplifying
x = 3

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