3x+100=7x+28

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Solution for 3x+100=7x+28 equation:


Simplifying
3x + 100 = 7x + 28

Reorder the terms:
100 + 3x = 7x + 28

Reorder the terms:
100 + 3x = 28 + 7x

Solving
100 + 3x = 28 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
100 + 3x + -7x = 28 + 7x + -7x

Combine like terms: 3x + -7x = -4x
100 + -4x = 28 + 7x + -7x

Combine like terms: 7x + -7x = 0
100 + -4x = 28 + 0
100 + -4x = 28

Add '-100' to each side of the equation.
100 + -100 + -4x = 28 + -100

Combine like terms: 100 + -100 = 0
0 + -4x = 28 + -100
-4x = 28 + -100

Combine like terms: 28 + -100 = -72
-4x = -72

Divide each side by '-4'.
x = 18

Simplifying
x = 18

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