中等MATH-INEQ-001
Solve 3x − 7 > 2x + 5.
A. x > 2
B. x > 12✓ 答案
C. x < 12
D. x > −2
解說
Subtract 2x and add 7: x > 12. The value 2 comes from subtracting the constants in the wrong direction. The inequality does not reverse, because the coefficient of x stays positive.