Answer:
12
Step-by-step explanation:
12x -1 = 143
+1 +1 (add one to each side)
12x = 144 (That would cancel out the -1)
12x/12= x (divide each side by 12, it would leave 12x as just 12)
144/12= 12
X=12
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x = 12
12x - 1 = 143
12x = 144
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