Answer:
[tex] \boxed{ \bold{ \huge{ \boxed{ \sf{a = - 1.75}}}}}[/tex]
Step-by-step explanation:
[tex] \sf{ \frac{ - 3}{4} = \frac{3a}{7} }[/tex]
Do cross multiplication
[tex] \dashrightarrow{ \sf{3a \times 4 = 7 \times ( - 3)}}[/tex]
[tex] \longrightarrow{ \sf{12a = - 21}}[/tex]
Divide both sides by 12
[tex] \longrightarrow{ \sf{ \frac{12a}{12} = \frac{ - 21}{12}}} [/tex]
Calculate
[tex] \longrightarrow{ \sf{a = - 1.75}}[/tex]
Hope I helped!
Best regards! :D
