98 - 3x = 10x + 20, solve for x.
subtract 98 from both sides
-3x = 10x - 78
subtract 10x from both sides
-13x = -78
multiply both sides by -1
13 x = 78
divide both sides by 13
x = 6
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If you mean:0 = 800 - 10x + 25 * 20 = 800-10x+25*210x = 800+50x = 8,50 = 800 - 10x + 25 * x * 20 = 800 - 10x + 50x-800 = 40x-50 = x
-10
Add 12 to each side: 4x + 6x = 20 ie 10x = 20 so x = 2
Subtract 20 from each side: n= 6. Job done. You could have done that!
20 = 400