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12x+15=2x-10
12x-2x=-10-15
10x=-25
x=-25/10
x=-2,5
Pembuktian
3(4.(-2,5)+5)=2((-2,5)-5)
3((-10)+5)=2(-7,5)
3(-5)=-15
-15=-15
Maaf jika jawabannya kurang tepat><v