body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Theory

$a + a = 2 a$

It two equal numbers or expressions are added, the sum can be rewritten as a product of

2

and the expression.

(3 + y - x) + (3 + y - x) = 2 (3 + y - x)

Recommended exercises

To get personalized recommended exercises, please login first.

Return to lesson.

Loading content