Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

7/2 == 2*x+9/10
algebra.equations.linear.balance.remove-div, factor=10
35 == 20*x+9
algebra.equations.linear.balance.con-left-minus, term=9
26 == 20*x
algebra.equations.linear.balance.scale-to-one, factor=20
13/10 == x
algebra.equations.linear.flip
x == 13/10