[tex](1.5 + 4x) \div 3 = 1.2[/tex]

[tex]1.5 + 4x = 3.6[/tex]

[tex]4x = - 1.5 + 3.6[/tex]

[tex]4x = 2.1[/tex]

[tex]x = 2.1 \div 4[/tex]

[tex]x = 0.525[/tex]

0.525*6=3.15