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245 10 times 2 equal 20 negative 3 times negative 4 equals 12 positive 12 times 20 equals 240 plus 5 equals 245
The answer is 27. You substitute the x with 2 and the z with three and you end up with. The ten is now twenty the -4 is now 12 (because negative times a negative is a positive) and the five stays the same so now you have 20+12+5. You then simplify the expression to 22+5 which  equals 27.