(7)3.4x+ 1.6x=6.4+4.1 (8)4.5*1.8 - 4.5*0.4x=7.2x
5x=10 8.1-1.8x=7.2x
x=10.5/5 8.1=9x
x=2.1 x=0.9
(9)12x+9=5x+58 (10)7.8 - 3.6=x+x
7x=49 2x=4.2
x=7 x=2.1
(11)9.5x - 0.9=7.1x-5.1 (12)0.8=2x+1.2x
2.4x=-4.2 x=0.25
x=-7/4
x=2
(7)3.4x+ 1.6x=6.4+4.1 (8)4.5*1.8 - 4.5*0.4x=7.2x
5x=10 8.1-1.8x=7.2x
x=10.5/5 8.1=9x
x=2.1 x=0.9
(9)12x+9=5x+58 (10)7.8 - 3.6=x+x
7x=49 2x=4.2
x=7 x=2.1
(11)9.5x - 0.9=7.1x-5.1 (12)0.8=2x+1.2x
2.4x=-4.2 x=0.25
x=-7/4
x=2