10x-7+x+7 = 11x
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10 x 7 or 70 square feet
47/10 x 43/7 = 4X10+7/10 X 4X7+3/7 = 47/10 X 31/7 = 47X31/10X7 = 1457/70 = 2057/70
x=7 look at the bottom for the reason: First, when a number and a variable are placed next to each other it means to multiply the 2. (example- what is 3x if x=7 ? Well, 3x7=21 so, 3x=21) so, 5x + 2x + 3x + 10x = 140 20x = 140 40/20 = 7 so, (5x7) + (2x7) + (3x7) + (10x7) = 140 so, 35 + 14 + 21 + 70 = 140
X plus 7-12?
7=x+1 6=x