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(10x-5)h7x+7
70hx^2-35hx+7
10hx^2-5hx+1
= 10x -5 x h x 7x + 7
= 10x x 7x -5 + 7 x h
= 70x - 2 x h
= 70x - 2h
koreksi lagi ya, maaf kalo ada yang salah