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do you mean 615+x *5
or 615*5 and 150*5
or what ?
615+X=150

5
When you multiply both sides by 5, the 5 under the phrase cancels out.
5x(615+X)=5x150

5
615+X=750
615615+X=750615
X=135
That is a great idea to use x for
"times" and X for the variable X.