Answer:
Step-by-step explanation:
25 - 3x = -5(1 - x) - 2x
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<u>We have to first get rid of the parenthesis:</u>
==> -5
==> 5x
<u>So now you should have:</u>
25 - 3x = -5 + 5x - 2x
<u>Combine like terms:</u>
25 - 3x = -5 + 5x - 2x
25 - 3x = -5 + 3x
<u>Add 3x to both sides:</u>
25 - 3x = -5 + 3x
+ 3x = + 3x
<u>And you should have:</u>
25 = -5 + 6x
<u></u>
<u>Add 5 to both sides:</u>
25 = -5 + 6x
+5 = +5
30 = 6x
<u>Divide 6 to both sides:</u>
= 
5 = x
5-x=x+9
2x=-4
x=-2
Therefore -2
$8 x 3 = $24
$15 + $24 = $39
The landscaping service costs $39
$10 x 3 = $30
Mary's neighbour costs $30
She should choose her neighbour because she is cheaper.
Hope I helped!
I would say yes, it is easier to subtract numbers when they are above and below each other because that ways you can easily borrow from the places in front of the number and rewrite without problems. It also helps keep the math more organized so that your work does not confuse you.
Hope this helps c:
