Kathryn W. answered 06/30/21
PhD in Engineering with 20+ years teaching College level Math
You are trying to find a number. Let's call it x. Read the sentence again and substitute x every time it says "number"
7 times x decreased by 12 is 18 more than 5 times x.
You know what "times" means, right? To multiply. Decrease means to subtract. "Is" is your equal sign. More than means to add. Make all the substitutions and read again and translate to math
7* x -12 = 18 +5*x
Now simplify and solve. I hope that helped Any other questions?