5x-7(3x+4)=100

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Solution for 5x-7(3x+4)=100 equation:


Simplifying
5x + -7(3x + 4) = 100

Reorder the terms:
5x + -7(4 + 3x) = 100
5x + (4 * -7 + 3x * -7) = 100
5x + (-28 + -21x) = 100

Reorder the terms:
-28 + 5x + -21x = 100

Combine like terms: 5x + -21x = -16x
-28 + -16x = 100

Solving
-28 + -16x = 100

Solving for variable 'x'.

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

Add '28' to each side of the equation.
-28 + 28 + -16x = 100 + 28

Combine like terms: -28 + 28 = 0
0 + -16x = 100 + 28
-16x = 100 + 28

Combine like terms: 100 + 28 = 128
-16x = 128

Divide each side by '-16'.
x = -8

Simplifying
x = -8

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