128 64x2 is the same as 64+64, which equals 128.
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The answer is 32.
2x+63=191 2x = 128 x = 64
Two to the sixth power. 8 with an exponent of 2 equals 64 and 4 with an exponent of 3 equals 64
53,11 x+y=64 x-y=42 combine terms 2x=106 x=53 substitute x and solve for y 53+y=64 y=11