(1)3.5x+x-14=18.4 (2)2.7*2-1.5x=0 (3)13x-6.8x+x=46.8 (4)17.5-0.5x=12.7 (5)5x-1.4x=54 Solve the equation, X for the unknown. And write the process

(1)3.5x+x-14=18.4 (2)2.7*2-1.5x=0 (3)13x-6.8x+x=46.8 (4)17.5-0.5x=12.7 (5)5x-1.4x=54 Solve the equation, X for the unknown. And write the process

(1)3.5x+x-14=18.4
4.5x=32.4
x=7.2
(2)2.7*2-1.5x=0
1.5x=5.4
x=3.6
(3)13x-6.8x+x=46.8
7.2x=46.8
x=6.5
(4)17.5-0.5x=12.7
0.5x=4.8
x=9.6
(5)5x-1.4x=54
3.6x=54
x=15

（11）4x*4.5-3x=6.33(12)13x-7.5x=18.7*3(13)(x+4)/5=6(14)3.96+1.8x=20.16(15)12*6+8x=120

（11）4x*4.5-3x=6.33
15x=6.33
x=0.422
(12)13x-7.5x=18.7*3
5.5x=56.1
x=10.2
(13)(x+4)/5=6
x+4=30
x=26
(14)3.96+1.8x=20.16
1.8x=16.2
x=9
(15)12*6+8x=120
8x=24
x=3

(6a+2b)(3a+3b)-4(a+b)

,(6a+2b)(3a+3b)-4(a+b)
=18a²+18ab+6ab+6b²-4a-4b
=18a²+24ab+6b²-4a-4b

Factorization: 3A ^ 3b-6a ^ 2B ^ 2 + 9ab ^ 3=________

3a^3b-6a^2b^2+9ab^3
=3ab(a^2-2ab+3b^2)