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10x-30+10\left(3-x\right)
Use the distributive property to multiply 5 by 2x-6.
10x-30+30-10x
Use the distributive property to multiply 10 by 3-x.
10x-10x
Add -30 and 30 to get 0.
0
Combine 10x and -10x to get 0.
0
Factor out 10.
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