5x+200=600-3x 5x-4=4x-3 79-3乘(x-1)=70.6 8乘 （2X-7)=5(x=13) 0.2乘(5x-1）=3+（19-5x)

5x+200=600-3x 5x+3x=600-200 8x=400 x=50 5x-4=4x-3 5x-4x=4-3 x=1 79-3(x-1)=70.6 79-3x+3=70.6 3x=82-70.6 3x=11.4 x=3.8 8(2x-7)=5(x+13) 16x-56=5x+65 11x=121 x=11 0.2(5x-1)=3+19-5x x-0.2=22-5x 6x=22.2 x=3.7