128=3X+7(X+4)

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Solution for 128=3X+7(X+4) equation:


Simplifying
128 = 3X + 7(X + 4)

Reorder the terms:
128 = 3X + 7(4 + X)
128 = 3X + (4 * 7 + X * 7)
128 = 3X + (28 + 7X)

Reorder the terms:
128 = 28 + 3X + 7X

Combine like terms: 3X + 7X = 10X
128 = 28 + 10X

Solving
128 = 28 + 10X

Solving for variable 'X'.

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

Add '-10X' to each side of the equation.
128 + -10X = 28 + 10X + -10X

Combine like terms: 10X + -10X = 0
128 + -10X = 28 + 0
128 + -10X = 28

Add '-128' to each side of the equation.
128 + -128 + -10X = 28 + -128

Combine like terms: 128 + -128 = 0
0 + -10X = 28 + -128
-10X = 28 + -128

Combine like terms: 28 + -128 = -100
-10X = -100

Divide each side by '-10'.
X = 10

Simplifying
X = 10

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