0.03x+20=0.07x+5 original equation
0.03x+20-0.03x=0.07x+5-0.03x subtract 0.03x from both sides to combine like terms
20=0.04x+5
20-5=0.04x+5-5 subtract 5 from both sides
15 = 0.04x
15/0.04 = 0.04x/0.04 divide both sies by 0.04 to get x alone.
375 = x <-------WOOOOOO! theres the answer!