Let's solve them step by step
4(3x + 2) = -10 Distribute the factor
12x +8 =-10 Add 10 to both sides
12x +8 +10= 0
12x +18=0 Subtract 18 to both sides
12x = -18 Divide both by 12
x = -3/2
b) 3(5 - x) = 7 + 2(x - 8)
3(5 - x) = 7 + 2(x - 8)
15 -3x = 7 +2x -16
-3x -2x =7 -16 -15
-5x = 7 -31
-5x =-24
5x=24
x=24/5
c) In this proportion, let's use the Fundamental property that allows us to cross multiply them like this:
After the simplification, we have x= -1/2.