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What does x = in this equation x+3+2x=x+5

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.