Mathematical Reasoning第 34 / 120 题
Solve for x: 3x + 7 = 22.
a.3
b.5
c.7
d.15
解析
Subtract 7 from both sides to get 3x = 15, then divide by 3 to find x = 5. Isolating the variable step by step solves a linear equation. Checking: 3(5) + 7 = 22, which is correct.
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