The answer is: x = 400
Here's how I got my answer:
Step 1: Subtract .60 from both sides. Leave us with [tex] 100=20+0.80x-0.60x [/tex]
Step 2: Simplify [tex] 20 + 0.80x - 0.60x [/tex] to [tex] 20 + 0.2x [/tex]. Which leaves us with [tex] 100 = 20 + 0.2x [/tex]
Step 3: Subtract 20 from both sides. Which leaves us with [tex] 100-20=0.2x [/tex]
Step 4: Simplify [tex] 100-20 [/tex] to 80. Which leaves us with [tex] 80 = 0.2x [/tex]
Step 5: Divide both sides by 0.2. Which leaves us with [tex] 80/0.2 = x [/tex]
Step 6: Simplify [tex] 80/0.2 [/tex] to 400. Which leaves us with our answer, x = 400
