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a. 2x+6=5x-10-2
2x-5x=-12-6
-3x=-18
x=6
b. 12x-7x+4=6x+18-6x
5x=18-4
5x=14
x=2,8
2.
a. x-4≤6x+21-9
1-6x≥12+4
-5x≥16
x≥-3,2
(tanda harus dibalik)
b. smua dikali 6 dahulu
=2(x-5)≥3(x-4)+6
2x-10≤3x-12+6
2x-3x≤-6+10
-x≤4
x≤-4
nomor3 4 5 aku nyerah, maaf