4+（-2)3×5
=4-30
=-26
9y-3(4y-2)
=9y-12y+6
=-3y+6
3x-0.5x=10
2.5x=10
x=4
3(x-1)+16(2x-3)=-16
3x-3+32x-48=-16
35x-51=-16
35x=51-16
35x=35
x=1