Question

a number decreased by 30 is the as 14 minus 3 times the number

Answer 1

n - 30 = 14 - 3n
n + 3n = 14 + 30
4n = 44
n = 44/4
n = 11

Answer 2

$x-30=14-3\cdot x\\x+3x=14+30\\4x=44\ /:4\\x=11\\\\Ans.\ 11$