Let x be the mysterious number. So...
2x + 3 = 20
Subtract both sides by 3:
2x = 17
Divide both sides by 2:
x = 17/2
Answer:
8.5
Explanation:
minus 3 from both sides
2x = 20-3= 17
2x=17
divide by 2
x = 8.5
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