It is difficult to tell what expression you are trying to convey.
8 multiplied by x, and then take y away, is 8x-y
x take away y, and then 8 multiplied by this number, is 8(x-y)
8 multiplied by x, and divided by y is 8x/y
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First write an algebraic equation for x, the number you are looking for. x-8 is the number decreased by 8 and that needs to equal 5x. x-8=5x so now subtract 5x from both sides and add 8 to both sides and we have -4x=8 so x is -2. Now we plug that back in the original English sentence. -2 decreased by 8 is -10 and 5 times -2 is negative 10.
x - (8 - x)
x(x+8)x^2 + 8x
6 x x=8
I believe you are supposed to calculate: 50 - (8 x 3)