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1050x-30x^{2}+7\left(300-35x+x^{2}\right)+12\left(140-8x\right)
Use the distributive property to multiply 30 by 35x-x^{2}.
1050x-30x^{2}+2100-245x+7x^{2}+12\left(140-8x\right)
Use the distributive property to multiply 7 by 300-35x+x^{2}.
805x-30x^{2}+2100+7x^{2}+12\left(140-8x\right)
Combine 1050x and -245x to get 805x.
805x-23x^{2}+2100+12\left(140-8x\right)
Combine -30x^{2} and 7x^{2} to get -23x^{2}.
805x-23x^{2}+2100+1680-96x
Use the distributive property to multiply 12 by 140-8x.
805x-23x^{2}+3780-96x
Add 2100 and 1680 to get 3780.
709x-23x^{2}+3780
Combine 805x and -96x to get 709x.
1050x-30x^{2}+7\left(300-35x+x^{2}\right)+12\left(140-8x\right)
Use the distributive property to multiply 30 by 35x-x^{2}.
1050x-30x^{2}+2100-245x+7x^{2}+12\left(140-8x\right)
Use the distributive property to multiply 7 by 300-35x+x^{2}.
805x-30x^{2}+2100+7x^{2}+12\left(140-8x\right)
Combine 1050x and -245x to get 805x.
805x-23x^{2}+2100+12\left(140-8x\right)
Combine -30x^{2} and 7x^{2} to get -23x^{2}.
805x-23x^{2}+2100+1680-96x
Use the distributive property to multiply 12 by 140-8x.
805x-23x^{2}+3780-96x
Add 2100 and 1680 to get 3780.
709x-23x^{2}+3780
Combine 805x and -96x to get 709x.