Question

Tim x e N

2x-7 =20+5.(-3)

Answer 1

2x - 7 = 20 + 5.(-3)

=> 2x - 7 = 20 - 15

=> 2x = 5 + 7

=> 2x = 12

=> x = 12 : 2

=> x = 6

Answer 2

\(2x-7=20+5.\left(-3\right)\)

\(\Leftrightarrow2x-7=20+\left(-15\right)\)

\(\Leftrightarrow2x-7=5\)

\(\Leftrightarrow2x=12\Leftrightarrow x=6\)

Answer 3

thank nha

Answer 4

\(2x-7=20+5.\left(-3\right)\)

\(\Leftrightarrow2x-7=20-15\)

\(\Leftrightarrow2x-7=5\)

\(\Leftrightarrow2x=5+7\)

\(\Leftrightarrow2x=12\)

\(\Leftrightarrow x=12\div2\)

\(\Leftrightarrow x=6\)

Vậy x = 5