2.jika 3(x + 2) +5 = 2(x + 15) nilai x+2 +..... 3.3 (a + 1) - a(2a - 3)=5

3(x+2)+5 = 2(x+15)
=3x+6+5 = 2x+30
=3x+11 = 2x+30
3x-2x = 30-11
x        = 19

x + 2 =?
19 + 2 = 21

9 (a+1) - a(2a-3)= 5
9a+9-2a²+3a-5=0
-2a²+9a+3a+9-5=0
2a²+9a-3a+4=0
2a²+6a+4=0
(2a+4)(a+1)=0
2a=-4
a1=2/-4=1/-2    ∨    a2=-1