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Let that number be x. At most 45 means equal to 45 or smaller than 45. So we have:
5(2x + 3) ≤ 45
10x + 15 ≤ 45 subtract 15 to both sides;
10x ≤ 30 divide by 10 to both sides;
x ≤ 3
Check for x = 3 or x = 1
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