if (isArithmeticOperator(operator = tk.getOperator())) { stk.push(nextToken().getReducedValue(ctx, ctx, variableFactory), operator);
if (isArithmeticOperator(operator = tk.getOperator())) { stk.push(nextToken().getReducedValue(ctx, ctx, variableFactory), operator);
if (isArithmeticOperator(operator = tk.getOperator())) { stk.push(nextToken().getReducedValue(ctx, ctx, variableFactory), operator);