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3(x-10)=8x-60
3x-30=8x-60
-30+60=8x-3x
30=5x
6=x
15. 5x-3≤3x+7
5x-3x≤7+3
2x≤10
x≤5
16. (x+3/3)-(2x-3/2)≤2/3
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2x+6-6x+9≤4
-4x+15≤4
-4x≤4-15
-4x≤-11
x≤11/4