5X + 5 = 25
subtract 5 from each side
5X + 5 - 5 = 25 - 5
5X = 20
divide both sides integers by 5
(5/5)X = 20/5
X = 4
-----------check in original equation by inserting 4 into X place
5(4) + 5 = 25
20 + 5 = 25
25 = 25
-----------checks
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5.
x-10=15 Add 10 to both sides x=25
-5x + 13 = -12 -5x = -12 - 13 = -25 x = -25/-5 = 5
5x - 1 = 24 5x - 1 + 1 = 24 + 1 5x = 25 5x/5 = 25/5 x = 5
4x+9=25 4x+9=25-9 4x/4=1 16/4=4 4x+9=26 4(4)+9=25 16+9=25 The answer is 4