、+++++++++++++++++++++++++++++99999999分28*（x+5)=560 7*（120-x）=3x 3*(22+x)=5x 3(y+4)=24 2.5x+48x2.5=260 9x=6*(10-x)这些咋解

、+++++++++++++++++++++++++++++99999999分28*（x+5)=560 7*（120-x）=3x 3*(22+x)=5x 3(y+4)=24 2.5x+48x2.5=260 9x=6*(10-x)这些咋解
、+++++++++++++++++++++++++++++99999999分
28*（x+5)=560 7*（120-x）=3x 3*(22+x)=5x 3(y+4)=24 2.5x+48x2.5=260 9x=6*(10-x)这些咋解

、+++++++++++++++++++++++++++++99999999分28*（x+5)=560 7*（120-x）=3x 3*(22+x)=5x 3(y+4)=24 2.5x+48x2.5=260 9x=6*(10-x)这些咋解
1.28x+140=560,28x=420,x=15
2.840-7x=3x,10x=840,x=84
3.66+3x=5x,2x=66,x=33
4.3y+12=24,3y=12,y=4
5.2.5x+120=260,2.5x=140,x=56
6.9x=60-6x,3x=60,x=20