You have said that [ x - (-8x) = x + 7 ] .
Note that [ - (-8x) ] = 8x
So the equation may be written as [ x + 8x = x + 7 ] .
Add up the 'x's on the left side: 9x = x + 7
Subtract 'x' from each side: 8x = 7
Divide each side by 8 : x = 7/8
x − ( − 8 ⋅ x ) = x + 7 x − ( − 8 x ) = x + 7 x + 8 x = x + 7 9 x = x + 7 9 x − x = x + 7 − x 8 x = 7 8 x : 8 = 7 : 8 x = 8 7
The number is 8 7 . We determined this by simplifying the equation and solving for x . Verification by substitution showed the solution is correct.
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DiketahuiAlas segitiga 6 cm dan tinggi 7 cmTinggi limas 9 cmDitanyaVolumeDijawabLuas alas[tex] = \frac{1}{2} \times 6 \times 7 \\ = 3 \times 7 \\ = 21[/tex]Volume[tex] = \frac{1}{3} \times 9 \times 21 \\ \\ = 3 \times 21 \\ = {63cm}^{3} [/tex]KesimpulanMaka volumenya 63cm2