6x+a=5 (x+t) make x the subject of the formula

X = - a/5 - 6/5c + t

so 6c+a=5 (x+t)

1. distribute the 5 to x and t

6c+a=5x+5t

then you want to get x alone - subtract/add on both sides.

6c+a=5x+5t

-a - a

6c=5x+5t-a

-6c - 6c

-5x - 5x

-5x = (-a) - 6c + 5t

then divide each side by negative 5 to get X.

X = - a/5 - 6/5c + t