是5x乘(2x-3.3),还是5乘(2x-3.3) ,是5x乘(x+1.2),还是5乘(x+1.2)
13x-5(2x-3.3)=24
13x - 10x + 16.5 = 24
3x = 24-16.5
3x = 7.5
x=2.5
16-5(x+1.2)=2x-4
16 - 5x - 6 = 2x - 4
10 + 4 = 2x + 5x
7x = 14
x=2