how?!?!?!?
12=(20-4x)/3
x=-4
please why is x -4?????
$$\\12=\frac{20-4x}{3}\\ $mult both sides by 3$\\ 36=20-4x\\ $subtract 20 from both sides$\\ 16=-4x\\ $divide both sides by -4$\\ x=-4$$
check answer
right hand side (RHS)
= (20-4*-4)/3
= (20--16)/3
=(20+16)/3
=36/3
=12
= LHS (Left hand side)
