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(1) \( 7 x-3=4 x+21 \) วิธีทำ \( \quad 7 x-3 \)

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Mar 13,2025

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\( x=8 \)

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เริ่มแรกเราจะย้าย \( 4x \) ไปทางซ้ายมือ และย้าย \( -3 \) ไปทางขวามือ เพื่อทำให้ \( x \) อยู่คนเดียว: \[ 7x - 4x = 21 + 3 \] ซึ่งจะได้: \[ 3x = 24 \] จากนั้น เราจะแบ่งทั้งสองข้างด้วย \( 3 \) เพื่อหาค่า \( x \): \[ x = \frac{24}{3} \] สุดท้ายจะได้ \( x = 8 \) นั่นเอง! ขั้นถัดไป อย่าลืมเช็คคำตอบด้วยการแทนค่า \( x = 8 \) กลับไปในสมการเดิมเพื่อดูว่ามันถูกต้องหรือไม่!

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