Here you go! Hope this helps
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lets distribute 7(x+3)
so 7(x)+7(3)
7x+21 or b
yay :)
You must try to remove one of the unknown variables from the system by multiplying one in a way that when adding (or subtracting) one to another “makes it disappear” and so whatever value you get can be substituted back in to get the other unknown!
Answer: a
Step-by-step explanation: its getting rid of water and the original is 40
478(900) + 478(95)
Hope this helps!