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-5-7x=7-x
-7x+x=7+5
-6x=12
x=12/-6
x=-2
x≤-2
2. 5x-6=2x+3
5x-2x=3+6
3x=9
x=9/3
x=3
jadi nilai x+5=3+5=8
3. 2x+7=5x-11
2x-5x=-11-7
-3x=-18
x=-18/-3
x=6
jadi x+3=6+3=9
semoga gk ada yang keliru
hehehe