18=3(2x-6)
Multiply the bracket by 3
18=3(2x)(3)(-6)
18=6x-18
Move -18 to the other side. Sign changes from -18 to +18.
18+18=6x-18+18
18+18=6x
36=6x
Divide by 6 for both sides.
36/6=6x/6
x=6
Answer: x=6
To do this without a calculator, the best method would be chunking.
Minus 36 from 936 in groups of ten until a smaller number is reached; record the number in each group.
936 - (10 x 36)
936 - 360 = 576
576 - (10 x 36)
576 - 360 = 216
216 - (5 x 36)
216 - 180 = 36
36 - (1 x 36)
36 - 36 = 0
Add up all the bold numbers
10 + 10 + 5 + 1 = 26
They seem to be very descriptive and use lots of examples of nature.
