Give the properly illustrated in each of the following:

__________1. 8+7=15
__________2. 4(3-5)=4(3)-4(5)
__________3. 10+(-10)=0
__________4. 3(-2)=-2(3)
__________5. 1.8=8
__________6. -2×(3×5)=(-2×3)×5

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