Just try to isolate the variables.
26) 3f - 2 = 13 add 2 to both sides
3f = 15 divide both sides by 3
f = 5
27) 2y - 10 = 14 add 10 to both sides
2y = 24 divide both sides by 2
y = 12
28) 5/7r + (-6) = 29 subtract -6 from both sides
5/7r = 35 divide both sides by 5/7. When you divide by a r = 49 fraction, multiply the number by the denominator and divide by the numerator (35 x 7)/5
