2X + 6X - 3 = 13
add 2X and 6X together
8X - 3 = 13
add 3 to each side
8X - 3 + 3 = 13 + 3
8X = 16
divide both sides integers by 8
(8/8)X = 16/8
X = 2
----------------check in original equation
2(2) + 6(2) - 3 = 13
4 + 12 - 3 = 13
13 = 13
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5
As follows:- 4n+13 = n-8 4n-n = -8-13 3n = -21 n = -7
13...... 9 plus 5 equals 14...... 14 minus 1 equals 13
It is -13.