解方程;120/4x=52和6x-8.3=56.92和2.8+7x=9.1和3x-8*4.2=58.8和10+7.5x=

1；4x=52X1/120 2; 6x=56.92+8.3 3; 7x=9.1-2.8 4; 3x-33.6=58.8
x=15/26 x=10.87 x=0.9 3x=92.4
x=30.8
5; 7.5x=70-10 6; 1.35+0.2x=8.05
x=8 0.2x=6.7
x=33.5