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-5x-4x=1-10
-9x=-9
x=-9/-9( dibaca -9 per -9 atau sama saja -9 dibagi -9)
x=1
2. 3x+12=7x-8
12+8=7x-3x
20=4x
20/4 (dibaca 20 per 4 atau 20 di bagi 4)=x
5=x
x + 2=5 + 2
=7