Answer:
here is the steps and solutions
a. -3b+11=8b-18 ⇔ 29=11b ⇔ b=29/11
b. -3x+15=15+18x-12x ⇔ -3x=18x-12x ⇔ -3x=6x ⇔ 9x=0 ⇔ x=0
c. 2c-3=12-2c+7c ⇔2c-3=12+5c ⇔ -15=3c ⇔ c=-5
:)
