Question

(x-12)-15=(20-7)-(18+x)

Answer 1

(x - 12) -15 = (20 - 7) - (18 + x)

x - 12 -15 = 20 - 7 - 18 - x

x - 27 = -5 - x

x - 27 + 5 + x = 0

2x - 22 = 0

2x = 0 + 22

2x = 22

x = 22 : 2 = 11

Answer 2

\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)

\(\Leftrightarrow x-12-15=20-7-18-x\)

\(\Leftrightarrow x+x=20-7-18+12+15\)

\(\Leftrightarrow2x=22\)

\(\Rightarrow x=11\)

Answer 3

(x-12)-15=(20-7)-(18+x)

=> x - 12 - 15 = 13 - 18 - x

=> x - 27 = -5 - x

=> x - 27 + 5 + x = 0

=> 2x - 22 = 0

=> 2x = 22

=> x = 11

Vậy x = 11.