Simplify 19/4a to 19a/4
61/28 + a = 19a/4 - 11/7
Multiply both sides by 4
61/7 + 4a = 19a - 44/7
Subtract 4a from both sides
61/7 = 19a - 44/7 - 4a
Simplify 19a - 44/7 - 4a to 15a - 44/7
61/7 = 15a - 44/7
Add 44/7 to both sides
61/7 + 44/7 = 15a
Simplify 61/7 + 44/7 to 15
15 = 15a
Divide both sides by 15
1 = a
Switch sides
a = 1