Question

45 x y - 30 = 12 x 15 - 40 x 3

Answer 1

\(45\cdot y-30=12\cdot15-40\cdot3\)

\(\Rightarrow45\cdot y-30=180-120\)

\(\Rightarrow45\cdot y-30=60\)

\(\Rightarrow45\cdot y=60+30\)

\(\Rightarrow45\cdot y=90\)

\(\Rightarrow y=90:45\)

\(\Rightarrow y=2\)

Answer 2

\(\Leftrightarrow45y-30=60\Leftrightarrow45y=90\Leftrightarrow y=2\)