15(15+3x)=20(20+x)

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Solution for 15(15+3x)=20(20+x) equation:


Simplifying
15(15 + 3x) = 20(20 + x)
(15 * 15 + 3x * 15) = 20(20 + x)
(225 + 45x) = 20(20 + x)
225 + 45x = (20 * 20 + x * 20)
225 + 45x = (400 + 20x)

Solving
225 + 45x = 400 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
225 + 45x + -20x = 400 + 20x + -20x

Combine like terms: 45x + -20x = 25x
225 + 25x = 400 + 20x + -20x

Combine like terms: 20x + -20x = 0
225 + 25x = 400 + 0
225 + 25x = 400

Add '-225' to each side of the equation.
225 + -225 + 25x = 400 + -225

Combine like terms: 225 + -225 = 0
0 + 25x = 400 + -225
25x = 400 + -225

Combine like terms: 400 + -225 = 175
25x = 175

Divide each side by '25'.
x = 7

Simplifying
x = 7

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