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A equals 4 because 4 plus 6 is 10 or 10 minus 6 is 4.
It can be: 5+10-5 = 10
Combining like terms, 16x + 20 = 180 or 16x = 160 so that x = 10
x = 10 Minus 6 times 10 = minus 60 Add 3 to minus 60 = minus 57
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