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The answer is 32.
6 + 2x = x - 6 2x - x = -6 -6 x = -12
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This problem can be solved by substituting (x) for the unknown number and (x + 28) as the number that is 28 more than the unknown number. Set up and solve the problem: x + (x + 28) = 156 (then simplify): 2x + 28 = 156 (subtract 28 from both sides of the equation to isolate the known numbers from the unknown): 2x = 128 (divide both sides by 2 to find the value of x) x (the unkown number) = 64 (now use the value of x to prove the answer) 64 + (64 + 28) = 64 + 92 = 156
18