Python

centerX = 15
centerY = 15
radius = 10
style = "fill:rgb(200,200,255);"
x = 1

message ='\t<circle cx="%s" cy="%s" r="%s" style="%s"/>\n' % (centerX+(x*((radius*2)+5)), centerY, radius, style)
print(message)

message2 = '\t<circle cx="{}" cy="{}" r="{}" style="{}"/>\n'.format(centerX+(x*((radius*2)+5)), centerY, radius, style)
print(message2)

Javascript

let centerX = 15
let centerY = 15
let radius = 10
let style = "fill:rgb(200,200,255);"
let x = 1

let message = `\t<circle cx="${centerX+(x*((radius*2)+5))}" cy="${centerY}" r="${radius}" style="${style}"/>\n`
console.log(message)