3x - 8 = 4
3x = 12
x = 4
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1 x 57, 3 x 19.
As a product of its prime factors: 2*2*3*5*7 = 420
You are looking for a number, known as x. If you add 3 to it, it equals 99. x plus 3 equals 99. x + 3 = 99 Now you need to subtract 3 from x, so x is by itself. To keep the equation balanced- and therefore correct- you need to subtract 3 from both sides. x + 3 - 3 = 99 - 3 x = 96 And there you have it.
you would find 39-3 because you subtract the lowest number from the smallest number witch equals 36
n + 20 - 17 + 13 - n = 20 - 17 + 13 = 3 + 13 = 16