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 ## Formula Calculation
 ### Instalation
 ```
 yarn add mathjs algebra.js
 ```
 ### Example
 ```ts
 import * as math from 'mathjs'
 import { Equation, parse } from 'algebra.js'
 const formula = 'dpp - (dpp*ppn) - (dpp*retribusi) - (dpp*service) - (dpp*ppn3)'
 const total = '300000'
 const variable = {
  ppn: 11,
  retribusi: 5000,
  service: 5,
  ppn3: 5000
 }
 try {
  const x1 = math.simplify(formula, variable).toString()
  console.log('Formula ', x1)
  const dppFormula = parse(x1)
  const totalFormula = parse(total)
  const equation = new Equation(totalFormula, dppFormula)
  console.log(equation.toString())
  const result = equation.solveFor('dpp').toString()
  console.log(result)
  const value = math.evaluate(result)
  console.log(value)
 } catch (e) {
  console.log(e)
 }
 ```