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ถ้า \( 4(x-2)=3 x-10 \) แล้ว \( x \) มีค่าตรงกับข้อใด ก. -1 \( \begin{array}{ll}\text { ค. }-3 & \text { ข. }-2\end{array} \)

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Jan 29,2025

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\( x = -2 \), ข้อ ข

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เมื่อเริ่มต้นจากสมการ \( 4(x-2)=3x-10 \) เราสามารถขยายสมการได้เป็น \( 4x - 8 = 3x - 10 \) จากนั้นนำ \( 3x \) ไปที่ด้านซ้ายเพื่อให้ได้ \( 4x - 3x - 8 = -10 \) ซึ่งจะให้ \( x - 8 = -10 \) สุดท้ายเพิ่ม 8 ทั้งสองด้านจะได้ \( x = -2 \) ดังนั้น ค่าของ \( x \) ที่ถูกต้องคือ ข. -2!

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