1) 95x-(32x+18x)+375=690
95x-50x+375=690
45x+375=690
45x=690-375
45x=315
x=7
2) 235+29x-(13x+12x)=335
235+29x-25x=335
235+4x=335
4x=335-235
4x=100
x=25
3) 113y-(97y-8y)+74=338
113y-89y+74=338
24y+74=338
24y=338-74
24y=264
y=11
4) 33+23y-(38y-27y)=129
33+23y-11y=129
33+12y=129
12y=129-33
12y=96
y=8