7
23
If x + 7 = 15, then 15 - 7 = x, therefore x = 8.If x = 8, then 4x is equal to 4 x 8 = 32.
22
3x+7=15 -7 -7 3x=6 (Divide) 3 3 x=2 Check it: 3(2)+7=15 6+7=15 15=15 :D
7
105.....see below 7 x 2 = 14 15 x 2 = 30 7 x 3 = 21 15 x 3 = 45 7 x 4 = 28 15 x 4 = 60 7 x 5 = 35 15 x 5 = 75 7 x 6 = 42 15 x 6 = 90 7 x 7 = 49 15 x 7 = 105 7 x 8 = 56 7 x 9 = 63 7 x 10 = 70 7 x 11 = 77 7 x 12 = 84 7 x 13 = 91 7 x 14 = 98 7 x 15 = 105
x - 7 = 8 x = 7 + 8 x = 15
7+x=15 x=8
22
x*15=105 divide both sides by 15 (x*15)/15=105/15 x=7
(x-7)/12 = x/15 x-7 = 0.8x 0.8x-x = -7 -0.2x = -7 x = 7/0.2 >x = 35<
(x + 15)
23
(7 - x/4) = 15 x/4 = 7 - 15 x/4 = -8 x = -32 Verification: 7 - ( -32/4) = 7 - (-8) = 7 + 8 = 15
If x + 7 = 15, then 15 - 7 = x, therefore x = 8.If x = 8, then 4x is equal to 4 x 8 = 32.
lcm(3, 7, 15) = 105. 3 = 3 7 = 7 15 = 3 x 5 lcm = 3 x 5 x 7 = 105