49
-7 + 28 = 21
228
3x + 7 = -4x + 28 implies 7x + 7 = 28
1 + 2 + 3 + 4 + 6 + 7 + 12 + 14 + 21 + 28 + 42 = 140
13 + 16 + 18 + 20 + 21 + 26 + 27 + 27 + 28 + 36 + 39 + 42 + 43 = 356
n = 7. 3(7) + 7 = 28. 21+7=28
Rephrase the question - it is not meaningful
basically you asked what -28+21 which equals -7
1/2 + 3/4 + 5/7 = 14/28 + 21/28 + 20/28 = 55/28
28 - 3(3 + 4) = 28 - (3 x 7) = 28 - 21 = 7
25x+3x+21 = 32+51+9 Collect all like terms together and notice the change from +21 to -21, this is done in order to keep the equation in balance. 25x+3X = 32+51+9-21 28x = 71 Divide both sides of the equation by 28 to find the value of x: x = 71/28 or 2 and 15/28 x = 2.535714286 as a decimal
28 + 28 = 56.56 + 28 = 84.