5x + 4  8x = 13
5x + 4 + 8x = 13
(Put the x variables together) 5x + 8x = 3x
3x + 4 = 13

4  4 (Subtract 4 from both sides)
3x = 9 (Divide both sides by 3 to get the 'x' by itself)
 
3 3
x = 3
5x+49 = 8x+13 4913 = 8x5x 36 = 3x x = 12
If 5x plus 3y equals 13, the x equals 2 and y equals 1. This is because 5x2=10 and 3x1=3, and 10+3=13.
8(1+5x) +5 = 13+5x => 8+40x + 5 = 13 +5x => 13+40x = 13+5x => 1313+40x = 1313+5x => 40x = 5x => 40x  5x = 0 => 35x = 0 => 35x/35 = 0/35 => x = 0
3x+7=5x13 > 3x5x=137 > 2x=6 > x=3
3x  7 = 5x + 132x = 20x = 10
5x  4x = 13  3 ie x = 10
5x+49 = 8x+13 4913 = 8x5x 36 = 3x x = 12
5x + 13 = 12 5x = 12  13 = 25 x = 25/5 = 5
If 5x plus 3y equals 13, the x equals 2 and y equals 1. This is because 5x2=10 and 3x1=3, and 10+3=13.
8(1+5x) +5 = 13+5x => 8+40x + 5 = 13 +5x => 13+40x = 13+5x => 1313+40x = 1313+5x => 40x = 5x => 40x  5x = 0 => 35x = 0 => 35x/35 = 0/35 => x = 0
3x+7=5x13 > 3x5x=137 > 2x=6 > x=3
If: 3x7 = 5x+13 Then: x = 10
3x  7 = 5x + 132x = 20x = 10
3x  7 = 5x + 133x  5x = 13 + 72x = 20x = 10x=3
x=3
X=10.
88=13+5x 13 13 75= 5x 75/5 =15 x=15