Question

Why is this true 7a+4-2a=7a+ -2a+4​

Answer 1

7a + 4 - 2a = 7a - 2a + 4

5a + 4 = 5a + 4

Explanation:

7a + 4 - 2a = 7a - 2a + 4

​7a + 4 - 2a

Rearrange the terms.

7a - 2a + 4

Combine like terms.

5a + 4

The left side simplifies to 5a + 4.

7a - 2a + 4

5a + 4

The right side also simplifies to 5a + 4.

Answer 2

Explanation:

Notice that both sides involve 7a - 2a, and both involve 4. By the associative property the order in which the addends appear is immaterial; the left side therefore equals the right side.