A=2pi(R+r)(R-r+h)

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Solution for A=2pi(R+r)(R-r+h) equation: 


Simplifying
A = 2pi(R + r)(R + -1r + h)

Reorder the terms:
A = 2ip(R + r)(R + h + -1r)

Multiply (R + r) * (R + h + -1r)
A = 2ip(R(R + h + -1r) + r(R + h + -1r))
A = 2ip((R * R + h * R + -1r * R) + r(R + h + -1r))
A = 2ip((R2 + hR + -1rR) + r(R + h + -1r))
A = 2ip(R2 + hR + -1rR + (R * r + h * r + -1r * r))

Reorder the terms:
A = 2ip(R2 + hR + -1rR + (hr + rR + -1r2))
A = 2ip(R2 + hR + -1rR + (hr + rR + -1r2))

Reorder the terms:
A = 2ip(R2 + hR + hr + -1rR + rR + -1r2)

Combine like terms: -1rR + rR = 0
A = 2ip(R2 + hR + hr + 0 + -1r2)
A = 2ip(R2 + hR + hr + -1r2)
A = (R2 * 2ip + hR * 2ip + hr * 2ip + -1r2 * 2ip)

Reorder the terms:
A = (2hipR + 2hipr + 2ipR2 + -2ipr2)
A = (2hipR + 2hipr + 2ipR2 + -2ipr2)

Solving
A = 2hipR + 2hipr + 2ipR2 + -2ipr2

Solving for variable 'A'.

Move all terms containing A to the left, all other terms to the right.

Simplifying
A = 2hipR + 2hipr + 2ipR2 + -2ipr2

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