Question

3(4.5-2x) - 1.8(x+5) - 5 (1.5 - 1.4 x)

Answer given is book -15/4​

Answer 1

Step-by-step explanation:

3(4.5-2x)-1.8(x+5)=5(1.5-1.4x)

We move all terms to the left:

3(4.5-2x)-1.8(x+5)-(5(1.5-1.4x))=0

We add all the numbers together, and all the variables

3(- 2x + 4.5) - 1.8(x + 5) - (5(- 1.4x + 1.5)) = 0

We multiply parentheses

-6x-1.8x-(5(-1.4x+1.5))+13.5-9=0

We calculate terms in parentheses:

5(-1.4x+1.5)

We multiply parentheses

-5x+7.5

Back to the equation:

-(-5x+7.5)

We add all the numbers together, and all

the variables

- 7.8x - (- 5x + 7.5) + 4.5 = 0

We get rid of parentheses

- 7.8x + 5x - 7.5 + 4.5 = 0We add all the numbers together, and all the variables

-2.8x-3=0

We move all terms containing x to the left, all other terms to the right

- 2.8x = 3

x = 3/- 2.8

x=-1+0.2/2.8