If you mean 4x-19x=50 then x = -3 1/3 or -10/3... Here's how I did it.
4x-19x=50 (4-19=-15)
-15x=50 (// -15; divide both sides by -15)
x=-50/15 (simplify)
x=-10/3 or -3 1/3
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50 x 50 = 2500
x + 50 = 2x + 100 50 = 2x+100-x 50 = x + 100 50-100=x -50=x -50+50=0 -100+100=0 it is zero
.75 or 75% How to get the solution: 37.5 = x * 50 ===> 35.5/50 = x * 50/50 ===> .75 = x
-40
50 x 3000 = 150000