what is x+3 = 8 please

Question

it is for my review I am in grade 7 need some help with this problem. thanks in advance

Answer 1

x + 3 = 8

subtract 3 from both sides (whatever you do to one side, do the same thing to the other side, and the equality still holds. It's an "equality" so treat both sides equally)

x+3 -3 = 8-3

x = 5

another way people look at the problem is you can move a number across the equality sign, move it from left side to the right side, but change its sign. move 3 from left side to right side, by changing its sign from +3 to -3

then x+3 = 8

x = 8-3

x= 5

check the answer

plug the answer into the original equation, replace x by 5

x + 3 = 8

5 + 3 = 8

8 = 8